Here are some tips i learned along the way to increasing your twitter followers:
add #followback in the box to the left
whoever that does follow you, check who follows them. you'll find the most recent ppl that subscribed and you'll usually get a followback within the day.
check the person's twitter acct to see how active they are. I usually follow ppl who shows activities within the last 24hrs.
You're going to want a pretty balanced followers and following ratio. i typically do not follow ppl who has alot of followers and low numbers of following. chances are they're going to unfollow you in the near future. Same goes with too many following and no followers. those accts gets flagged more often than not by twitter. plus those accts typically won't unfollow you if you do not follow them back. most likely they're shell accts created to cheat in bounties.
mute everyone you follow in hopes of receiving a followback except for your bounty sign-up twitter accts you have to follow. much easier to go down the list and unfollow ppl who aren't following you and not accidentally unfollow a bounty twitter acct you have to follow. there's programs out there to do that as well but i find them not too reliable.
Hello. Really thank you for your advice. I give you 1 karma

But I have a problem, i follow so many people and my ratio isn't good.
But i don't know how to see people i followed which not follewed me in return.
It's complicate with a huge number of followers.
Do you have an advice for that ? Just see poeple who don't follow us ?
I subscribe to your channel Linkdefeu, subscribe to my channel too.
Say me to mp you come to here.
https://twitter.com/Kitcho68
Thank you. I follow you and all members on the list at this moment
