The site with more than 500 Million Users, is tough to get away with bugs. They obviously cannot regenerate each and every flow after integration of their new features.
Anyways this is the one that I just came across while posting a link on a friend’s wall and tagging him in that post too. Seems pretty simple but I bet you wont be able to do this, atleast at the time of writing this post. It gives up a popup error stating Something went wrong. We’re working on getting it fixed as soon as we can.
I tried the same on some other people’s walls too but the result was this same bug,
I hope FB has an auto ticketer to ticket such bugs so that they come to notice, if not than Facebook you might find this post someday :).