What's up with the # on Tweets and Facebook?

[colossalkite877]

First, it was the @ for clicking people's names that were tagged, then... this? I'm trying to figure out the main purpose behind this.... Please. Someone. Explain.

[yahoo answers you]

http://www.everydaytweet.com/2009/04/wha...itter.html

[Annalyse]

on twitter is so when you click on it, it will go to all the other tweets with that hashtag ( # ), but using # on facebook, well really that isn't for anything, it's just lame..

[Brandon W]

That is a hash tag. It is primarially used on Twitter, For example, if I was composing a tweet, I might write : Had an awesome day in #essex ! This would allow people who type essex into twitter to see my tweet! My twitter account : http://www.twitter.com/bwilliams127