For unlocking our image obsession.

A year ago, the social scrapbooking site was dubbed the fastest-growing web service in history. Where do you go from there? Up. Pinterest is now one of the top 50 most-visited sites in the U.S., and retailers are excited: The average purchase off a pinboard nets more than double those off a wall post or a tweet. Late last year, it simplified the process for companies to create pinboards. In January, it made its first acquisition, the recipe site Punchfork. Meanwhile, the Pinterestization of the web continues--a trend as hot as Pinterest itself.

[Push Pin: Wavebreakmedia via Shutterstock]