The next time you could use a happiness boost, perhaps you should seek out a friend in a good mood. Just be sure not to bring your friend down inadvertently.

下次你想要寻求一个快乐催化剂的时候，或许你应该选择一个快乐的朋友作为目标，但是要切记注意不要不经意地把你的朋友也搞得不快乐了。

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LAST week, if you wanted to use the latest slang to tell a friend he was cool, you could have called him "Obama," as in: "Dude, you're rocking the new Pre phone?"

发自上周，如果你想用最新的俚语告诉你的朋友他很酷，你不妨叫他奥巴马，就像这样：嘿，你拿的是新上市的手机吗？

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If you think someone could use a friend, Be one.

如果你认为谁能成为你的朋友，你就是他的朋友。

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You could use it to spot that a friend is a couple of blocks away and arrange an impromptu meeting.

CNN: Face to Facebook: social networks hit the streets