Well the question you should be asking is why you want all of those followers. If you are trying to get followers in order to promote content then just randomly

Well the question you should be asking is why you want all of those followers. If you are trying to get followers in order to promote content then just randomly following people is going to produce very low click through rates as the people are likely not interested in what you have to say. However if you are trying to get a lot of followers to get paid to promote services, then that is the way to go.