While some opt for quick fixes, like buying followers (something I have never done), I don't see the point in these sketchy tactics. It may offer short-term spike, but it doesn't provide the kind of engagement that organic followers do.
When I joined the social media movement in March of 2009, I was just an observer for the first six months. But by remaining consistent and sticking with daily-following methods, my account began to grow. Now with more than 380,000 followers, people often ask me for advice on growing a following on Twitter.
Here are a few very simple ways to grow your following (along with the process of what I do on Twitter) that you could also implement on your other social channels.