Report: Pinterest is third most-visited social site

(CNN) -- Think back six months. You probably never had heard of a little website called Pinterest.

Now it's the third most-visited social-networking site in the United States, according to a report released Thursday by Experian Marketing Services, a digital marketing firm.

Pinterest, which lets its users "pin" photos and info from the Internet onto virtual boards, ranks behind only Facebook and Twitter in terms of total visitors, according to the analysis, titled "The 2012 Digital Marketer: Benchmark and Trend Report."

The ranking is based on the total number of U.S. visitors during March and does not include mobile traffic, according to Experian spokeswoman Jennifer Marshall.

Last month, Facebook had more than 7 billion total visitors; Twitter had 182 million; and Pinterest had 104 million total visits from people in the United States, according to data sent to CNN by Experian.           Read More