Twitter hashtag

Hashtags and Twitter... Personally I don't really understand Twitter all that much, and up until this class I didn't even have an account.  When I created mine the first thing I did was I looked at the trending topics and saw what was going on in the Twittersphere.  I clicked on a few sports related hashtags and started to like reading other people's tweets.  I'm not sure if sports are really important, but they are the main thing I'm interested in.  It seems like the most important thing for everyone on twitter is themselves.  Twitter is your opinion and without that there wouldn't be anything interesting going on.  That's what makes Twitter interesting.