Social media marketing is a term that describes use of social networks, online communities, blogs, wikis or any other online collaborative media for marketing, sales, public relations and customer service. Common social media marketing tools include Twitter, LinkedIn, Facebook, Flickr, Wikipedia, Orkut and YouTube.

In the context of internet marketing, social media refers to a collective group of web properties whose content is primarily published by users, not direct employees of the property (e.g., the vast majority of video on YouTube is published by non-YouTube employees).