I have a twitter account with a niche following and I'm trying to promote a service I'm offering (facebook likes, youtube views and twitter fans) but I find it hard to get people clicking on the links to my service. It's not like the twitter account is just set up to spam people, I do offer value and interact with my followers but still no one seems to check out my links. What tips can you give me for getting the traffic from twitter to go to the page where they can buy my services? Any particular type of message that works well? Need some advice from people who are using twitter to get traffic. Thanks.