I use Twitter to keep in touch with friends as well as share news and blog posts I found interesting. I recommend you go through my "following" list and add most of these users I follow.
I don't follow-back bots or spammers, and in fact I don't follow back regular humans who aren't that interesting to me. It's not my way of being snobbish or elitist or anything like that, I just don't want my twitter feed cluttered with useless garbage, forcing me to wade through it to find the stuff I really want to read/know about. If I follow you, it's because I think you have something to say worth hearing and/or I like you on a personal level. I check every user that follows me to see if they are saying something interesting and do not hesitate to follow those who are. I don't think this policy is selfish or elitist, I think it's just good sense and I recommend everyone on Twitter adopt a similar policy.
When I am just browsing Twitter (i.e. users I don't already follow), what I do is search for a topic I like and then go to the profile of users I found that had an interesting tweet on the subject, then I start browsing who they follow. You can usually find some curious oddities and occasionally people worth following.