You'll find the longer you are here, and the more active you are, the more followers you tend to have. I am terrible about updating my "follow" status. They come in and I say, "Yeah, I gotta do that." and then people fall off the grid or I forgot they were following etc.
Also, I tend to wait until someone has submitted several reviews and I've read their responses in the forum before following them, nearly all the time. I like to get to know someone first.
Usually if someone has no reviews and I have not seen them on the forum, I'll wait to get to know them before following.