Semantic Web startup Radar Networks raised $13 million in a B round, led by Velocity Interactive Group. Velocity’s Ross Levinsohn will join the board. Other investors include Draper Fisher Jurvetson and Paul Allen’s Vulcan Capital. The company previously raised $5 million from Vulcan, Leapfrog Ventures, Ron Conway, and Peter Rip.

Radar Networks is the company behind Twine, a site in private beta that helps you organize the Web and your personal information by automatically tagging and cataloging everything you save to it. (For more, see our write-up).