I control multiple Twitter accounts, below are my SEO relevant Twitter accounts (6 accounts).
My Twitter follow policy is I follow MOST accounts back:
I tend NOT to follow non-English accounts, users which lack a profile image or a biography.
I avoid following porn/adult accounts and users who excessively auto-tweet.
I make exceptions, but if you want me to followback take the above into account.
Continue Reading Twitter Users Who Follow Back SEO List