Facebook and Messenger just updated to the next generation exclusively for Windows 10. While Instagram has been updated exclusively for Windows 10 Mobile. They were updated on April 28, 2016.
https://www.microsoft.com/en-us/store/a ... zdncrfj2wl
https://www.microsoft.com/en-us/store/a ... zdncrf0083
https://www.microsoft.com/en-us/store/a ... blggh5l9xt (Mobile only)
I just downloaded it yesterday, and it rocks!
Anyone interested?