Windows: We're familiar with Flock as the browser that bakes social networking tools into Firefox. A new beta uses Chrome as the base browser, and as you might expect, it's a lighter, thinner browser, with the same convenient posting and reading tools.
From the outset, you'll notice the big differences between Flock and the Chrome it's built on. A pop-in sidebar offers and aggregated view of your friends' updates and your messages on Twitter, Facebook, Flickr and YouTube. A left-side button provides quick posting to Twitter or Facebook, and the home page offers links to some of Flock's deeper functionality, like grouping your social network contacts and letting you search them out or message them in sets.
There is, however, much more to find in Flock, and it supports the majority of Chrome features, including extensions. If you're already using extensions to gain quick access to social tools in Chrome, you'll want to try out Flock's beta. It's a free download for Windows systems only, with a Mac version on the way.