[fab]

one way is you use exchange sites, you create a false account, follow many people, then switches to your real account and asks to follow

[kat82]

I have seen celebrities get free followers with no follow back. Either become a celebrity or focus on producing quality content. Trust me you will get as many followers that wont require you to follow back

[oldbuddy]

Offer something coming in the future that is highly desirable that your visitor will not want to miss, so they subscribe to be in on the know.