Normally people follow twitter users after checking what they are tweeting about, how active they are and how popular they are, unless the follower is a spammer who does not care whom he is following.
It is time consuming and painful task to find people and twitter users who post something you are interested in. So this site Twollow would help you do that automatically, by automatically following the people who use some keywords that you are interested in.
Twollow is a very simple site which would make you add some keywords that you are interested in, and then when it detects some members who have used the same keywords, it would make your account autofollow that member. One small fear with this would be that you might auto follow hundreds of members at a time if you set some words like apple, google, phone, twitter etc. which are very frequent in the twitter world.
So here is how you set a keyword to auto follow people -
Login and go to the keywords page -

Then add a keyword and set it for the feed -

You are done, you can edit it or delete the keyword later -

You can go to Twollow at www.twollow.com

quite nice service, will be useful. thanks for sharing
Wow… twitter apps keep adding everyday… Is twitter really that powerful ?
twollow is new for me. I will check it out.