San Francisco-based PubNub announced it has raised an $11 million Series B round that was led by Scale Venture Partners. Existing investors Relay Ventures and TiE Angels also participated in the round. PubNub has now raised $15.5 million in total funding. As part of the investment, Andy Vitus, a partner at ScaleVP, has joined the board. The company provides a cloud infrastructure for apps to enable dashboards and streams, collaboration and 2nd screen synchronization on iOS, Android and other platforms.