We've all heard of flash mobs, but what on earth is a cash mob? As it turns out, it's like a flash mob, only it involves a shopping spree designed to help boost a local business.

Just like Fight Club, there are some rules about organizing a cash mob, although the Cash Mobs website insists that these are completely optional and can be tweaked. A few notable rules:

• The mob date must be announced at least a week in advance via Twitter.

• The location at which to meet will be announced, but not the specific business to support.

• The business must have products for both men and women.

• The business must be within one block of a locally owned watering hole.

Sounds like a great way to support businesses that support the local community and to meet new people. On the downside, it does seem a little easy for businesses to manipulate the idea for their own gains.

Anyone ever been part of a cash mob?

[Image courtesy of Flickr user BlatantWorld.com]