Tumblr is more flexible in my opinion. There's something to Posterous which makes it powerful for what tumblr was designed to do but Tumblr seems better for lon

Tumblr is more flexible in my opinion. There's something to Posterous which makes it powerful for what tumblr was designed to do but Tumblr seems better for longer form content. Posterous = BYOC (Bring your own Community) Tumblr = BYOC + Utilize Tumblr's user base and promotion tools.