I tend to follow only hubbers who write on topics I'm interested in, and whose hubs are well-written...meaning mostly free of grammar and spelling errors. (Nobosy's perfect!) After all, a follow is not only a boost to the ego of the hubber, but a recommendation from me to my own followers that that hubber is a good (even fantastic) writer and worth checking out.
When I see that a new follower has followed 20 (or more) other hubbers in quick succession...say, in the last hour or so...I DO NOT follow back. I call such people... usually newbies..."warehousers". NOT a good method for attracting followers in return!