Facebook Connect was a good first attempt at this, but sadly they quickly closed down their API that allowed you to invite your Facebook Friends to join third-party services.

Facebook Connect本来牵了一个好头，但难过的是他们很快又关闭了请求Facebook中朋友加入第三方的接口。

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Entrepreneur Connect: Share ideas, join groups, publish content and promote your business on Entrepreneur's own network.

Entrepreneur Connect：这是美国《企业家》集团旗下的网站，在《企业家》自己社交网络中分享观点、参加团体、发表内容、促进你的交易。

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Join your local library to connect to a great health and fitness resource. Check out low-fat cookbooks and copy your favorite recipes.

去你当地的图书馆查阅好的实用的健身资源，寻找一些低脂肪的食谱并抄下自己喜欢的。

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Join her community here or connect with her here.

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Some cycle to make political statements while others join to exercise, see friends or connect with strangers over a mutual passion.

BBC: Buenos Aires�� Critical Mass

You also can join alumni groups on LinkedIn or Facebook and connect with fellow alumni, even if you don't know them personally.

WSJ: Job Hunting in the Off Season