If you are using Twitter, you probably have a few contacts (= people you follow). Probably more than just a few. If you live a liberal following policy (= if another user follows you, you follow back), then the network of your contact does not have any deeper meaning. But there is a smaller, much more meaningful network hidden behind your total web of followers: the relevant net. TwitterFriends helps you to find the users that are meaningful for you and keep in touch with them. Those could be users you are talking to on a regular basis or who are feeding you great links all the time.

Blocky works by blocking Twitter spammers from your account.

Blocky maintains a list of Twitter spammers, and blocks them from ever tweeting or following you.

Refollow helps you discover, manage, and protect your Twitter social circle.

We found ourselves wanting to see what our friends were up to “at a glance”.
By using the Twitter web site, our “active” friends often push the status messages of less active friends far down the page, or off the page completely.

TwitThis is an easy way for people to send Twitter messages about your blog post or website. When visitors to your website click on the TwitThis button or link, it takes the URL of the webpage and creates a shorter URL using TinyURL. Then visitors can send this shortened URL and a description of the web page to all of their friends on Twitter.

Anyone and everyone who uses Twitter periodically sends out interesting links to their followers. These links are not pointing to your site, so other than creating goodwill among your followers, they offer no ‘return’ for your blog.

Twitterbelle is a new twitter online services, it can analyzes your recent Twitter favorites and tells you who you favorite the most.

The useage of Twitterbelle is very simple – what you need to do is typing your Twitter username, all the other works are done by Twitterbelle.

TwitterBackgrounds is written by a bunch of guys who love twitter, and they are working hard to build the best Twitter backgrounds site around.

TwitterBackgrounds has the largest selection of free Twitter backgrounds and each design is made by them in house.