This week was a busy one for several social media brands who launched new looks just in time for the holiday season.  Yesterday, I posted about the changes at Twitter, but YouTube and StumbleUpon also announced changes and Facebook finally began rolling out Timeline.  Here’s a quick look at the changes.

Twitter: Launches a new site design and new features

YouTube: Launches a new design to make it easier to find your channels and new videos

StumbleUpon: Launches new logo and site design

Facebook: The long-awaited and oft-dreaded Timeline is rolled out