100 million Like buttons clicked a day

As a result, in the third quarter of this year, an average of 100 million "Like" buttons were being clicked on Facebook every day. That's double the amount of liking going on, compared with the same period last year.

Corporations are doing this for a reason, of course. They're building marketing lists, they're aiming to boost sales, and they're planting themselves in users' news feeds.

When Coca-Cola has more than 36 million Likes, and Disney has more than 29 million, they've assembled a ready-made audience that can be tapped at any time.

And here's a little secret: While companies are certainly happy to have you as a fan, what they're really interested in isn't you; it's your friends.

Because if you officially Like Starbucks, your friends see that you've liked Starbucks, and they become more likely to spend there as well.

"Friends of fans represent a much larger set of consumers than the brand's own fans," says Elisabeth Diana, Facebook's manager of corporate communications. "In fact they're 81 times the size of the actual fan base, so Likes are a way to reach those people as well."

Beware, though, that Liking something publicly makes companies keenly interested in who you are and where you're surfing.

"Facebook 'Like' buttons are increasing in prevalence across the Web, raising serious privacy concerns for those who value the privacy of their online reading habits," says Rainey Reitman, activism director for the San Francisco-based Electronic Frontier Foundation.

"This collection of information about one's Web browsing habits may violate many users' expectations of privacy. Our reading habits can be incredibly sensitive, and Facebook has a long history of playing fast and loose with user privacy."

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