Microblogging software startup Tumblr raised $750,000 in a first round that included Vimeo founder Jakob Lodwick. He's not just a user, he's an investor! 21-year old Tumblr founder David Karp says Vimeo and Tumblr are planning further integration soon. Tumblr has no revenue yet, but has picked up 100,000 users since launching 7 months ago. [Silicon Alley Insider]