Yahoo! announced thier Microblogging service, Twitter clone as Yahoo Meme. Like Twitter and Tumblr you can post, repost, share contents and search other people’s public accounts and follow them with Yahoo Meme. On the other hand Yahoo Meme, allows you to post different type of content like text, pictures, video and even music.
Login to http://meme.yahoo.com and create an acoount or leave your email in the text box and click "i want in!". After receiving confirmation you have an empty micro blog.
To know more about Yahoo Meme, visit ReadWriteWeb - Hands On With Yahoo's Twitter 'Clone' .