In the coming weeks, Google will shut down Google Buzz to focus their social media efforts solely on Google+. Users will still be able to see previously-posted content on their Google Profile and download it using Google Takeout.
In addition to Buzz, iGoogle's social features and Google Labs will be shut down. Google is also discontinuing its Code Search feature as well as Jaiku (similar to Twitter) on January 15, 2012.
As of last Thursday, Google+ has garnered more than 40 million users since its launch three months ago. However, there has been a downward trend in site traffic in recent weeks.