By August, flash MOBS were popping up in cities around the world and the concept became the subject of countless blog posts and news reports.

到了8月，快闪族出没在世界各大城市街头，这一概念成为无数博文和新闻报道的主题。

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Instead there is talk of sit-ins and flash mobs as well as the rally this weekend.

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Its original aim was to, in effect, create flash mobs at participating businesses which would offer a coupon for a short time, usually 24 hours.

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Commercialization is a part of the movement's evolution, says Ms. Lawrence, who says the company hires hundreds of dancers a year to participate in corporate flash mobs.

WSJ: Spontaneity for Hire: Flash Mobs Go Corporate