Sometimes we can get wrapped up in just tweeting what we feel or want to say and we forget about hashtags. Hashtags on Twitter are a great way to get more followers as well as to find information you are interested in.
If you are interested in raising your follower count on Twitter make sure you use relevant hashtags for the content you are sharing on Twitter. People that are interested in that content will be able to find your tweets and be more likely to follow you.
For some examples of what #hashtags look like on Twitter follow this link for #tumblr search on Twitter.