Ask HN: Could Tumblr eventually challenge Facebook for social dominance?
Is Tumblr the internet's sleeping giant?
UPDATE: Heres some food for thought; I run a relatively "cool" blog, and my follower counts are as follow: Twitter - 1950, Facebook 'Fans' - 3,850, RSS - 4,500 ... Tumblr - 7,500 (it's up 1,000 since last week). That also translates to Tumblr being my third largest referrer after Stumble Upon and Twitter. Facebook is hard to quantify however.