When an certain event happens and every friend you have updates their status about it.
It's the first snow of the year and there's a Facebook frenzy where everyone is posting about the fact that is snowing like the sky itself is falling.
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When a Facebook friend doesn't log on for a week or more, and then when they finally log on, they go manic all over your wall and comment on everything you've posted since they last logged on.
Man, my mom was bipolar booking last night.....35 new comments on my wall.