I tapped on one of them and I got error after error not being able to resolve the url or something, it was very fast and I couldn't read the message. I had to restart the phone because I was unable to close the app, it kept bringing it back on even after putting the phone in airplane mode.
Long press someone's name on their comment or post and you can tag them there. You also probably need to have Settings - User Tags - Store Source Link enabled.
Thanks. Just Settings user tags was off for me (by default?). I was about to move apps.
Ooooh thank you :D