How does a social network differ from a portal? How are the two similar?

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Social networks involve a group of people, shared social interaction, common ties among members, and people who share an area for some period of time. Portals are general-purpose content providers that have a varied selection of features and capabilities. 

Social networks are different from portals in that content creation is done almost exclusively by the members of social networks, whereas portals both create and aggregate content from elsewhere. 

The two are similar in that their goal is to keep visitors on their sites for a long time or to mold themselves as a “sticky” destination site. Also, many portals have social networking features.

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