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It's better to ask questions first than file a complaint later, and the BBB tells us that in this infographic, an inquiry consists of "a customer seeking out our business information," and that generally happens before a purchase. The BBB handles complaints after purchases as well, which are listed separately on the table below.
As you're probably aware, most scams won't work unless a prospective victim willingly participates. So keep in mind: If something seems too good to be true, it probably is.
[img src="http://www.bbb.org/blog/wp-content/uploads/2011/07/top-online-scams.png" caption="" credit="" alt="Top Online Scams [Infographic]"]
Top Online Scams [Infographic] compliments of Better Business Bureau