What does the # mean in a tweet?
The "#" in a tweet use to mean the word "number" for example "I so wish I had his #, I would call and ask him out!", but the symbol also known as a hashtag is really being used in another way these days. According to readwriteweb, hashtags are a way for adding metadata to your tweets which basically means that it creates a group for tracking different topics. http://www.readwriteweb.com/archives/what_does_that_hashtag_mean_new_service_tells_you.phpThe hashtag # in front of a word helps to organize and find tweets on specific topics. I like the way that everydaytweet.com describes them as "a way of creating file folders and sticky notes in book pages". I have included a link to their page if you want more information http://www.everydaytweet.com/2009/04/what-does-the-hashtag-symbol-mean-on-twitter.html
# = hashtag