TUMBLR is killing it. In 2011 they surpassed WordPress.com in total number of blogs hosted (currently closing in on 38 million blogs) and in October they became the first platform to host President Obama’s blog.
If you’re not familiar with Tumblr, it’s a platform for sharing content – images, video, text, quotes, chats, audio – in an easy to use and aesthetically pleasing way. Unlike other blogging platforms, content you like on other people’s Tumblrs can be “reblogged” on yours, similar to “retweeting” on your twitter stream or embedding someone else’s video to your blog via youtube or vimeo. Reblogging enables users to create a kind of scrapbook of what they like on the internet, and facilitates community building around particular content areas.