Startups: Don't Host Your Blog on Tumblr
A mistake people seem to make is assuming Tumblr is a blogging platform akin to Wordpress.com, it isn't, it's a different beast entirely. The majority of Tumblr is the "community" of ~teenagers sharing pictures and videos and posts, Tumblr revolves around the dashboard not individual blogs. Sure you can host your company blog there, but do tumblr <i>care</i> about the uptime of that vs. the uptime of their dashboard?