social networking site

noun

a website that allows subscribers to interact, typically by requesting that others add them to their visible list of contacts, by forming or joining sub-groups based around shared interests, or publishing content so that a specified group of subscribers can access it

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for social networking site

Contemporary Examples of social networking site

Social-networking-site use among Internet users ages 65 and older has grown more than 150 percent over the last three years.
Dear Old People: The Internet Is Forever
Brandy Zadrozny
July 25, 2013