The other day I had one of those moments where a simple idea came to my head and I did a little test with it.
The idea was about niche tweetering where I would look for a niche in tweeter itself and make a new account, befriend everyone in the niche and see what they talk about so I could get new insight in new niches.
What i found out is that there are a bunch of niches in Tweeter where you can get new friends, send visitors to your website, visit some new websites that you might not know about etc.
One of the things I found out was that if you follow - people follow you and those people are always visiting websites recommended by people they follow.
From a niche with 124 people, I got 67 visits when I sent a tweet out.
All you have to do is put whatever keyword you are looking for and find your niche.
I just thought it might be something you might want to look into