In Japan,there a lot of Twitter tools as well as in other areas.Some of them are useful for increasing your follower.For instance,"Onitter"and"follotter" The former works like a Tweetadder but follow only 10acc/day.It`s for free. The latter is a automatic f4f system. It`s also for free. In using them ,you don`t need to keep your PC on. I` m looking for the same kind of Twitter tools in other areas. Do you know that kind of tools?