On the way to becoming an unstoppable social media behemoth, Facebook slipped a lot of wacky stuff onto its website. These are the best tricks Facebook has pulled, past and present.
Upside-Down Facebook
What It Does: The engineers had fun with Facebook's language settings. This pic shows what happens when you set your language to "English (upside down)," but you can also try out "English (Pirate)" which (among other things) will arrange your timeline by "shots o' rum" and "turns o' yer hourglass."
Current Status: In full effect.
The Name Generator
What It Does: This one started with users noticing that if they typed @[4:0] into a comment or wall post, it would change it to "Mark Zuckerberg." As it turns out, that's Facebook's way of calling usernames, and it works for any number. (Zuckerberg came on as user #4, after three test profiles.)
If you want to find the number that calls out your own name, just go to your profile page and, in the url, replace "www" with "graph." You should end up with something that looks like this, with the number on the second line.
Current Status: Still going.