In my new funny video/pictue blog I have around 100 followers and tend to get around 10-20 clicks per tweet. Most likely because they are followers interested in my content. Just have to build up my followers now.
Traffic comes based on the power of the tweet you are writing. No one clicks on the link if it don't have really good and interesting content. So, content in tweet should be good enough to take the users to your site. So, try to write the tweets with powerful content.
Twitter traffic is very temporary in my case..I don't know..but somehow twitter is not working well for me. It does bring many visitors but very few percentage becomes regular. Digg has worked good for me though..