I start to use a new twitter auto follow service on the net http://www.fastautofollow.com/, found that is great, I need not to do any manual works, my twitter followers increased automatically everyday.It works real people I am following and who are following back, a 5 star product that I recommend to anyone!
SocialOomph wasn't too hard. And for a free tool to auto follow and welcome, that seems useful for me and others.
i've just been testing out social oomph and i've found it very difficult to use and am doubtful i will fork out when my free trial ends. needs a decent user interface urgently.