FACEBOOK is alerting up to a million people that their login details may have been compromised by hundreds of iffy apps.

The tech giant has uncovered more than 400 malicious Android and iOS apps this year which steal usernames and passwords.

They masquerade as popular services like photo editors, games and VPNs.

It all centres around the "Login With Facebook" which allows people to easily access stuff without having to sign up all over again.

Often these apps ask you to login using Facebook to access the promised features, but actually malware steals your sensitive details.

This then means hackers can get into your Facebook account and do what they like, such as message friends to scam them and take even more of your personal information.

Meta - Facebook's owner - is notifying one million users, though it doesn't know exactly how many could be affected.

Not everyone the firm contacts will have been hit, as experts have decided to be extremely cautious and cast the net wide.

45 out of the 400 apps it found were on iOS, while the rest were on Android.

"Cybercriminals know how popular these types of apps are and use these themes to trick people and steal their accounts and information," explained David Agranovich, Facebook's director of threat disruption. 

"Because these apps were accessible in third-party app stores, we’re encouraging people to be cautious when downloading a new app that asks for social media credentials and providing practical steps to help people stay safe."

The vast majority were photo editing apps (42.6 per cent), followed by business utility (15.4 per cent) and phone utility (14.1 per cent).

Games and VPNs both made up 11.4 per cent each, while lifestyle-related apps stood at 4.4 percent.

Facebook has issued some advice on what to look out for when an app uses "Login with Facebook".

If an app is unusable without your Facebook information, think twice.

For example, be suspicious of a photo editing app that needs your Facebook login and password before allowing you to use it.

Check out the app's download count, ratings and reviews, including negative ones.

And consider whether the app provides the functionality it says it will, either before or after logging in.

You can see a full list of malicious apps Facebook found further down this page.

If you believe you've downloaded one, experts recommend you do the following:

Here's a full list of apps Facebook claims is stealing people's login details.

CallShowLite Apex Race Game CallerPaper Show Video Converter Master Acetoon Photo Cartoon Photo Frame PIP Collage Maker ZodiHoroscope – Fortune Finder Ads Manager Helper Ad Optimization Meta Ad Manager For Social Agent John FPS Game Unblocked Website Best Fun Cam Psychology Facts Cool Photo Editor Cool Filter Editor Ads & Page Ads Pages Manager Constellation Master AppLock-Lock Apps & Privacy Guard Smooth Picture Editor Text Camera Artoon Photo Cartoon Creator Pics Art Ashtoon Cartoon Editor Perfect Photo Effects | Loop Photo Animator Bomb Master 3D Free Music Downloader & Free Mp3 Downloader Beauty Camera Beauty Camera Plus Photo Editor Beauty Makeup Camera Art Puzzle 2021 Biscuit Coco Cam Blue-shoot Game Blur Photo Bluetouch Shooting Game Ranger Crash Game Bamboo VPN Border Sticker Camera Skintoon – Labs of Cartoon Business Planner Manage Classic filter camera PIP Camera 2022 Candles VPN Perfect Puzzles Photo editor PIP collage maker ToonPrisma – 3D Photo Effect HD Video Player with music BeautyCam YouToon – AI Cartoon Effect Play Phoot Editor & Collage Photo Filter Color Call Photo PIP Camera Craftsart Cartoon Photo Tools Creatoon Face Editor Photo Video Editor:Lena Editor Crown Camera Photo Pro 2021 Ads Manager Plus Maker PIP Gallery Pages Dashboard Photoquipo Cartoon Pic Effect Flyingfish Wallpaper CameraAdorn CreatorMould ElegantImage Deep Wallpaper-live,HD Videolancer – Pro Video Maker PIP Collage Coco Dress up Charming 3 Patti King – India Rummy Face Picture QR Barcode Scan Atec Sparkle Photo Editor 2022 Enjoy Photo Editor Ding Ding Photo Effect Editor Art Photo Puzzle Cartoon Face Photo Editor Savetoon Art – Face Cartoon Facetoon Photo Art Fast VPN Proxy Ads Optimize Ads Manager For Business Pica Artoon Face Editor Photo Layout Editor Instapic: Photo Editor Pro, Collage Maker Shape Photo Editor Share Photo Maker Speedy Vpn Tunnel Moldish – Men’s Photo Editor FlyFish Speed Stylist Fonts for Keyboard PIP Editor Frame Photo Flash QRCode Scanner Transcend VPN Free VPN Master Super Tuber VPN Tuber VPN – Free&Secure VPN Proxy Server Fast Vpn Tunnel Photo Puzzle 2021 Lone Hero Racing Share Photo Editor Arts Photos Art Filters:Photo to Painting Game Booster Vinto Cam Emotion Checker Ghost VPN Proxy Train Photo Anime Photo Photo Editor Pic Collage Train Photo Frame Hiyoo Hidenode pro All in one Doc Editor & Viewer Fun Wallpaper Hotspot Free VPN Highquality Purple Wallpaper PIP Editor Image Ice Selfie Beauty Cam Image Move Puzzle Business from Instagram Wonderful Camera Ora Horoscope – Fortune Finder Ding Ding Photo Editor Sketch CamPlus Instant Translator Kangaroo VPN Photoont – Photo Collage Edit Palmistry Reading Free Toonex Photo Editor 2022 Male fitness Pic Collage & Cartoon Editor 4K Camera Hyper Photo Filters Life Run Lighting Creator Toon Lightning VPN Files Clear PhotoEditor Lofa – Studio Photo Cartoon Lucky Catcher – Catch Them All Lucky Number Pro Video Remaker MadToon Face Cartoon Magic Horoscope GB WA Warna Latest Version Free Comic Photos Foster – Cartoon Photo Effect NeoSnap Photo Editor Business Ads for Meta Business Meta Manager Meta Optimizer – Ads Analysis Meteor vpn Nebula Wallpaper Photo Editor – Frame Effect Full Screen Video Editor Nice Photo Sticker Maker Pro Mold Figure Gym Mood Camera Astro Horoscope Guide 2022 MuMus Music Player Photo PIP 2022 Camera PIP Nuclear VPN Proxy Okenyo Studio Creatoon Pana Camera Daily Fitness OL Onlan Cartoon Editor Soda Music Player Palmistry of Destiny Popular Emoji Hot Sexy Girls Perfect Photo Album Pewee Photoon – Photo Cartoon Photo PIP Critical Strike Ops – FPS 3D shooting Game Tower Defense Zone – Batmen Rush Simple Photo Adjuster Blur Effect Camera Photo Gaming Puzzle Panorama Camera Pip Camera 2022 Photo editor Pro Sweet Summer Camera App Abrasive Photo Editor Photo Editors Rainbow Photo Plaze Photo Sticker&Camera:make you beauty Pic collage: photo editor&beauty image Camera PIP Editor PIP Pic Camera Photo Editor PIP Photo PIP Editor Collage Pixa: Photo Editor & Collage Maker ToonArt Treasures of the Pharaoh PIP Pic Camera Photo Editor Photo Collage Maker Pic Perfect Photo Editor Smart AppLock Cool Lock Pulse Music Player Pumpkin VPN Punk Vpn Pure-VPN:Fast Stable Secure internet Proxy Deep Art Effects Real Driving Papatoon Face Art Editor Camera Photo Editor PIP Magic 2022 Photo Video Creator with Music Pop Ringtone Christmas Sticker Camera App Ads Manager for Meta Rocket Connect Rush Car 3D Rush Hour 3D – Heavy Traffic Video Editor Safe Link Cartoon Illustrator PIPO GIF Surf Vpn Sealand Music Player Swarm Photo Perfect ProCam Fission Effectdo Pic Editor ShineStar Camera Light Exposure Photo Editor Cartoon Cam Pro High HD Wallpapers 4K Amazing Photo Puzzle Smart SMS Messages Snap Beauty Camera Snap Editor Pro Snap Face Camera Sandwich SnapBeauty Cam Sofa Cartoon – Pro Editor PIP 2022 Drift Speed Racing Game Speed Booster SplitScreen PIP PicMix Photo Editor Star Line PIP PHOTO Pvideo Superior Speed SurfVPN – Fast VPN Proxy S-VPN Proxy S VPN – Fast & Safe VPN Client Lightly Camera Sweet Beauty Plus Camera Beauty Sweet Camera Speedy Turbo Fantastic camera Flying Photo Cartoon Keyboard Theme Translation Assistant Torrent Torch VPN Proxy Touch VPN Master Traffic Tour 3D Photazo – PIP & Cartoon Effect MotoM3X-PoolParty Tuber VPN Proxy Tubo VPN Master Secure Turbo Turbo Net Unlimited Net VPN Lite – Fast & Easy use VPN Vender Add Text on Photo Video Editor 2021 Virgo VPN Viva VPN Booster Vivid Cooleditor Voice Changer Private VPN HD 4K Wallpaper Keep Step Pista – Cartoon Photo Effect Magical Daily Astrology Reader Brilliant Photo FancyPhoto PixEditor Piestra – Comic & Blend Effect Smart PDF Reader and Editor Female Fitness Workout Pro Toolkit Xcar Highway Race Xeva Photo Cartoon GIFs-Search Animated GIF & Stickers 2021 MagicCamPlus Enjoy Art Photo Xona Relaxing Sounds MAGIC PHOTO PUZZLE Cartoon Effects Photo Editor Photo Editor Wall Y VPN Master ZooMate VPN Proxy Vilatouch crash game Vilatouch crash car Online Shooter FPS Free Music Downloader & Music Player Crash Racing Game Beauty Camera Filter Action Flame FPS Drift Sprint Racing Game CityRanger Racing Game Thefun Camera Desert Hunting Game Try to spin Lunar Zodiac Horoscope Callshow Flash Grape Media Player Tean Music Player Male Fitness 2020 2022 Ultra Camera Code Name-Vulture FPS OL Kangaroo Fast VPN Muses Music Player Red Camera Snap: HD Photo Editor Lightning Drift Racing One-Sweet Camera Baby Camera BatterySafe Crash Race Master Donfan Music Player Mulu Music Player Musae Music Player Night Hunter Game Teana Music Player Goat Safe VPN SnapBeauty Cam Filter Mostfun Media Music OseaCamera Pomelo Music Player Sealod Music Player SeaShell Music Player ProFlash Kite camera Apex Crash Race Impostor Master Solo Kill 2021 Instant Drag Speed Racing Extreme Speed Race NoneCanDie City Crash Racing Game Callpaper Show Sunday Media Player Flame Shock FPS Modern Time Camera Rainbow Square- Sort Puzzle Tea Bag Camera

iOS: FB Advertising Optimization Business ADS Manager Ads Analytics FB Adverts Optimization FB Analytic FB Adverts Community Adverts Ai Optimize Very Business Manager FB Business Support Fb Ads Meta Optimizer Business Manager Pages Adverts Manager Meta Adverts Manager Ad Optimization Meta FB Pages Manager Business Ads Meta Business Business Suite Manager FB Ads Cost Adverts Bussiness Suite Business Ads Clock Ads & Pages Business Suite Business & Ads Business Manager Overview Business Suite Ads Page Suite Manager Business Meta Support Pages Manager Suite Business Meta Pages Business Suite Ads Ads Business Knowledge Page Suite Managers Pages Managers Suite Ads Business Advance Pages Manager Suite Business Suite Optimize Business Manager Suite Business Suite Managers Ads Business Manager Ads Business Suite Business Manager Pages Business Adverts Manager Ads Manager Suite Business Manager Pages Ads & Business Suite

Some apps may have the same name as something legitimate, so watch out for that.

And obviously if you have downloaded one, delete it immediately.

Social media apps like Facebook, TikTok and WhatsApp have become vastly popular - but are always hiding new features or leading viral trends. So here are some of the best things to know...

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