What's with the messages with # before them?

[Amanda]

Lately I've noticed that a lot of people on facebook are posting messages with # before them like #iamsouthpark or #supernatural, stuff like that. I was just wondering what the hell the # was for?

[Bob]

Thats twitter
To tag a subject for searches in twitter, you put a hash (#) in front of the word.

Go to twitter.com and in the search box enter # then the word you saw and it will bring up a list of posts tagged with that word

[Tipi Horowitz]

It's a twitter hashtag. People use them to tag people/things in twitter posts, and they're also used on facebook for fun.

[dannyboy2111]

A lot of people have Twitter and Facebook Linked so when they update there status on either site it will be posted on both sites on Twitter # means a Topic