Some 84% of global online consumers aged 16 and older report sharing content online.
Social media users are more likely to respond to product offers shared by friends and family in their networks than to offers included in sponsored posts and social display ads.
Nearly all photography-related social commerce orders came from the network, and 94% of sports and recreation as well as pet supplies did, too.
Study also finds that the path-to-purchase has shortened to a little more than 2 days, even for higher-ticket items.
Casual dining tops the list this year, taking the top spot from Appliances.
Nearly half of online buyers surveyed by Compete had purchased books online in the past three months, while 41% had bought movies, music and video games.
Retail websites were more commonly used for product research than search engines, online ads, online reviews, retail emails and a wide variety of other information sources before consumers made online purchases.
Community site categories accounted for 4 of the 10 top-gaining web categories by percentage change in July 2012, led by pets sites.