Social Media News Ticker: Yahoo! Buys Tumblr, Twitter Acquires Lucky Sort, Pinterest Mobile Updates

Here’s your quick weekly summary of all the latest social media news, including changes and new features on Google+, Twitter, Pinterest and Tumblr:

Google+

Google+ Redesign
Google+ Redesign

Twitter

Yahoo Places Tweets in News Stream
Yahoo! Places Tweets in News Stream

Pinterest

Tumblr

Any updates to social networks that we missed?