what are the different types of social networking sites?
['Social networking sites. Most of us are familiar with social networking sites like Facebook, Twitter, and LinkedIn. ... ', "Social review sites. What's one of the first things you do when planning a trip or buying a new product? ... ", 'Image sharing sites. ... ', 'Video hosting sites. ... ', 'Community blogs. ... ', 'Discussion sites. ... ', 'Sharing economy networks.']