Redwood City, Calif. - Flock, the developer of a social Web browser, announced on Thursday that it has completed a $15 million fourth round of venture funding, led by Fidelity Ventures.

Mountain View, Calif. - Flock on Monday announced the full release of version 1.0 of its free, social Web browsing software for Mac, PC and Linux, which allows users to manage multiple social services like Facebook, Flickr, YouTube and Twitter from a single interface. The service's features include the ability to integrate friends from social networks into the browser, so users can see when their friends have posted updates, and drag-and-drop sharing of media from social media sites with friends that have been loaded into the browser.