One of the more Orwellian moments I've experienced on Facebook happened when it didn't allow me to send an image link to my sister in a private chat because the string had sex written in it.

We're both adults and have been using Messenger to talk to each other every day for a few years now, but nope Facebook wouldn't relent. It even froze my ability to message her from my smartphone app for a short amount of time.

This amuses me more than it annoys me, because someone at Facebook decided that it's a good idea for a messaging product to censor private conversations between adults. What on Earth led them to believe that my messaging app should be my nanny?

EDIT: Here's a screenshot of the dialog: http://oi65.tinypic.com/33wt9br.jpg