Tumblr strives to be a social network all by itself -- it fosters a vibrant network of bloggers by actively encouraging them to reblog other Tumblr-based blogs.
Return to Microblogger shootout: Posterous Spaces vs. Tumblr
Image gallery: Posterous Spaces vs. Tumblr
A new wave of free sites encourages fast blogging, multimedia entries and social networking.
Shop Tech Products at Amazon