The content of a micro-blog differs from a traditional blog due to the limited space per message. Many micro-blogs provide short messages about personal matters, commentary on a person-to-person level, or a link dump.
The most popular service is Twitter, which was launched in July 2006 and won the Web Award in the blog category at the 2007 South by Southwest Conference in Austin, Texas. The main competitor to Twitter has been Jaiku (although this has since been acquired by Google and closed public registrations).
Recently, however, new services with the feature of micro-blogging have been born. Digg founder Kevin Rose, together with three other developers recently launched a service called Pownce, which integrates micro-blogging with file-sharing and event invitations.
Microblogging services which seek to add to the minimalism of raw microblogging include Spoink, Plurk and Rakawa. Spoink released a multimedia micro-blogging service that integrates blogging, podcasting, telephony and SMS texting and supports all major mobile audio, video and picture formats. Plurk utilizes a rich interface and horizontal time-line to add a spatial dimension to microblogging. Rakawa.net documents and informs about daily accomplishments of the users based on the question "What have you achieved today?"
In May, 2007, an article counted a total of 111 Twitter-like sites internationally.
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