For once, the biggest news in social media and real-time technologies didn’t come from Facebook. Rather, it was Google that, at the end of the second quarter, introduced an innovative collection of technologies, under the Google+ label. Another big headline was the return of digital music: Pandora filed a successful IPO, and Google and Apple unrolled cloud-based music offerings. Meanwhile, other social networks generated valuable lessons about technology and business strategies. LinkedIn went public, while Myspace was sold. And Apple essentially appointed Twitter its mobile social network infrastructure supplier. Additional companies mentioned in this report include Skype, Groupon, Turntable.fm and Amazon. For a full list of companies, and to read the full report, sign up for a free trial.