The audience of social media has grown exponentially over time, becoming in effect a new universe of prospects to explore. As a result of this, even the measurement and tracking of social media is now essential for the identification of revenue (direct and indirect) associated with users of social channels.
Utility: The difference between the Share button and +1 on Google+
Here is the last function inserted in webmaster tools: a new tool that will ask Google to ignore (disavow) the backlink you think of low quality, but above all can be so regarded by Google, thus eroding the quality and positioning of the your site.
When born Google Buzz and Google Wave, I tried intrigued them for a bit 'but after some time I gave these experiments of Google because, in my opinion, would not have been successful. I am not certainly a visionary but, years later, time has proved me right as well as giving me reason Google+ that continues to grow continuously.