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The search giant's social network isn't about to disappear. And if you use it wisely, you can supersize your online presence

Justin Bieber's singer-actress girlfriend became a celebrity investor by putting her stamp of approval on a postcard start-up. There's another celebrity investor on the block: actress-singer Selena Gomez. The 19-year-old joins a handful of former MySpace executives, among others, in a $750,000 angel-investment round for Postcard on the Run.

One of Google Plus's most unique features, Circles, initially attracted users to the service and set it apart from competitors.