With Mr.Tweet you can find people on Twitter who are interested in specific topics and categories.   Related posts: Join Twibes Twitter Groups Twitter Multiple Account Manager Verify Your New Twitter Followers

Put a retweet button on your blog and your most popular posts will be tracked with Tweetmeme.   Related posts: What Are Your Competitors’ Most Popular Posts? Track Topics On Twitter Track Your Twitter Searches

Created by the guys over at Blogstorm.co.uk, Twitition lets you create, sign and share petitions with people on Twitter. As of December 2010, Twitition.com had:   – 388,000 followers – 1,996,816 signatures (almost 2 million!) – 59,164 petitions on the site – 830,000 monthly visitors -2.1 million monthly page views

Lists of top Twitterers based on followers, friends and number of updates.     Related posts: Twitter Karma Conversations On Twitter Sort Your Tweets By Topic Or Group

This site offers free web services access to their data through remote access API. ‘The API strives to be simple to use in both on-line and desktop applications. It is based on standard HTTP queries and XML based responses.’ If you’re working on a book related project, this site offers

Video chat with up to six people at the same time at Oovoo. Create free account to use free video calling services. Guarantees privacy, i.e. no monitoring or filtering. Related posts: Show Related Posts in WordPress Free Open Source Help Center How To Make Your Own Video Player on HTML5

It’s always amazing: to see all the personal information about you that’s available online. This people search engine finds age, addresses, relatives and more. It finds basic info, refers to other services and displays lots of ads. Searching social network profiles, pictures etc. is for pay only.     Related