If you've been on Twitter, Instagram or Facebook over the last day or so - or received an odd message on WhatsApp - you'll have noticed that there's a lot of strange pictures floating around.
If you've been caught on the hop by a picture of your mate looking particularly rough, and have checked that they're not hungover, it may be because they've Faceapped themselves.
Just like the recent 'baby face' filter on Snapchat, Faceapp's 'old age' filter has been sweeping social media with some very amusing results.
A number of celebrities have even joined in the fun, including the Jonas Brothers, while others have used it on pictures of figures like JFK and Bruce Lee with eerie results...
When you take a trip to the Year 3000. pic.twitter.com/O9Dxpwj6ex
— Jonas Brothers (@jonasbrothers) July 16, 2019
— Gordon Ramsay (@GordonRamsay) July 16, 2019
— terry crews (@terrycrews) July 16, 2019
Mfw a new face app drops pic.twitter.com/jufIpp86mK
— joshua caleb weibley (@_living_well) July 16, 2019
— BrooklynDad_Defiant! (@mmpadellan) July 17, 2019
— MiltonTPike1 (@MiltonTPike1) July 17, 2019
— Eric Appel (@erockappel) July 17, 2019
— em wick 💫 (@johnwicksgf) July 17, 2019
Pharrell before and after on faceapp old age pic.twitter.com/LfZpmkLR8a
— ETC!ETC! (@IAMETC) July 17, 2019
— T$E CHUN (@thetzechun) July 17, 2019
— Negan Jeffrey (@mynameisNegan) July 17, 2019
— Quincy Jones (@QuincyDJones) July 17, 2019
However, others have warned users to beware of what they're signing up to when they use the app...
If you use #FaceApp you are giving them a license to use your photos, your name, your username, and your likeness for any purpose including commercial purposes (like on a billboard or internet ad) -- see their Terms: https://t.co/e0sTgzowoN pic.twitter.com/XzYxRdXZ9q
— Elizabeth Potts Weinstein (@ElizabethPW) July 17, 2019
So in short, download it by all means - but be aware of what you're giving it permission for.