You may be asking yourself "what is social media marketing?". Well here I am to give you the answer and the definition.

In basic terms, social media marketing is a form of Internet marketing that targets social news, social friendship, and social bookmarking sites. This type of marketing broadcasts to an array of users across a social network.

Refer to Wikipedia's article: Social Media Marketing

Also check out Social Media Marketing Tactics

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The second link was fascinating! I'm no fan of social media sites, so it was great to see them all reviewed like that. Thanks.