A Good Mass Follow/Unfollow tool

Hey guys,
First post here. I have around 20k Twitter followers right now. I have been manually following and mass following and it has began to get tedious and tends to take a long time. I was wondering if anyone had any better ideas of how to do this? Or any services that make following and unfollowing easier? Thanks!

If you got the cash, check out followliker. Leave it on and carry on your day

Yeah, I just purchased Followliker a few days ago and I'm pretty satisfied with it. Its expensive, but worth it.

You should buy a bot to do it for you.
I've only tried TwitterAttack and gotta say that I like it, also heard good things about FollowLiker.
And if you have some spare time you can go for a free alternative like https://addons.mozilla.org/en-US/firefox/addon/imacros-for-firefox/ for firefox or similar.