There are many sites like twiends.com who claims to Grow Your Twitter Followers , Free Retweets and Website Traffic.
I found one very good site which is more rewarding than twiends.com. We can add websites here. So we can increase website traffic. We can also add twitter account here. SO we can increase twitter followers for free.
Click here to visit this awesome site :TraffUp
There is also space for retweets so if we give some points to users they will retweet our twitter tweet. So, basically its very useful site to get traffic,retweet counts and twitter followers. And we can also buy points here at Traffup.