Flock is a web browser that specialises in providing social networking and Web 2.0 facilities built into its user interface. Until the current version, Flock used the Gecko HTML rendering engine by Mozilla.  The upcoming version 3 will use the Chromium rendering engine.
Flock integrates social networking and media services including MySpace, Facebook, YouTube, Twitter, Flickr, Blogger, Gmail, Yahoo! Mail, etc. Notably, when logging into any of the supported social services, Flock can track updates from friends: profiles, uploaded photos, and more. Flock has Twitter Search functionality, multi-casting of status updates to multiple services, and the introduction of instant messaging via Facebook Chat in the browser.
Other features include:
* native sharing of text, links, photos and videos
* a “Media Bar” showing preview of online videos and photos as well as subscription to photo and video feeds
* a feed reader supporting Atom, RSS, and Media RSS feeds
* a blog editor and reader, allowing direct posting into any designated blog
* a Webkit-mail component allowing users to check supported web-based email off site, compose new messages, and drag-and-drop pictures and videos from the “Media Bar” or webclipboard into a new email message
* support for third-party add-ons, including a number of Firefox extensions.
Flock 2.6 delivers a more personal experience of the web, where its users are in control and more connected to what’s important to them. By automatically managing updates and media from popular social services such as MySpace, Facebook, Bebo, Twitter, Digg, Flickr, AOL Webmail, Yahoo! Mail, Gmail, and YouTube, Flock makes sharing with friends and services drag-and-drop easy.

New Features in 2.6.1

• Incorporated Mozilla’s 3.0.19 patch for Firefox.

Fixed Issues

• Fixed the Delicious login detection issue.

For Windows, versions are also available for Linux and Mac OSX.