Flock, being that social web browser you know, gets another $15 million in a Series D round, according to Duncan over at The Inquisitr.

Flock’s user base has grown 250% since January this year, with revenue rising by more than 400% over the same time period. Flock was named the winner of the Webby Award in the Social Networking category, beating both Facebook and Bebo.

Impressive. Now if the Flock web browser would be so kind and be a bit more pretty, and fine-tune the inclusion of all these social online services, then I’d be a lot happier. For the record, I think it’s a good browser, but not yet a choice to Firefox.