It seems as though many "experts" tell us that in order to get followers on Twitter, you must follow others. The hope is that others will reciprocate and follow you...if you follow them. I've seen Twitter accounts that follow thousands of others. Do they really read the other posts? I doubt it.
My own experiments with Twitter have gone a little differently than the norm. I don't follow others unless they are really interesting. How has that affected my own "followers?" Well, the

numbers speak for themselves. Although I don't follow anyone from my
Tips for Speakers I do have 123 followers on that Twitter account. They all seem to have found me using the Twitter search function. If people are interested, they will find you. If they find you they probably will have a better chance of actually reading your messages...which is what Twitter is really about.