Reuters: Google’s shares closed up 16.3 percent at $699.62 on Friday, adding about $65 billion to its market value, as strong growth in YouTube viewership eased investor concerns about Facebook’s push into video. Google said that watch time for YouTube rose 60 percent in the second quarter and the video service had more viewers aged 18-49 on mobile alone than any U.S. cable network. Online video ads could be a $17 billion opportunity in the United States alone by 2017, and YouTube looks best positioned to benefit.