By Elizabeth Cogswell Baskin

Editor’s note: Launched in March 2010, Pinterest now ranks as the third most-visited social-networking site in the United States, according to a recent report by Experian Marketing Services. Pinterest, which lets its users “pin” photos and information onto virtual boards, ranks behind only Facebook and Twitter in terms of total visitors, according to the report. It also skews heavily female — about 60% of users are women.