Mainstream media (MSM) are those media disseminated via the largest distribution channels, which therefore represent what the majority of media consumers are likely to encounter. The term also denotes those media generally reflective of the prevailing currents of thought, influence, or activity.
Large news conglomerates, including newspapers and broadcast media, which underwent successive mergers in the U.S. and elsewhere at an increasing rate beginning in the 1990s, are often referenced by the term. This concentration of media ownership has raised concerns of a homogenization of viewpoints presented to news consumers. Consequently, the term mainstream media has been widely used in conversation and the blogosphere, often in oppositional, pejorative, or dismissive senses, in discussion of the mass media and media bias.
Media organizations such as CBS and the New York Times set the tone for other smaller news organizations by creating conversations which cascade down to the smaller news organizations lacking the resources to do more individual research and coverage, that primary method being through the Associated Press where many news organizations get their news. This results in a recycling effect wherein organic thought is left to the mainstream that choose the conversation and smaller organizations recite absent of a variance in perspective.
Alternative terms 
Markos Moulitsas, founder of the Democratic blog Daily Kos, argues that by calling old media mainstream, new media is inherently marginalized, and thus prefers to use the term "traditional media" instead.
Lamestream media, a pun based on replacing the word "main" with "lame" in the word "mainstream," is a pejorative alternative term. Sarah Palin has been widely reported referring to lamestream media, notably during her participation in the Tea Party Express, in the context of what she perceives as misrepresentation of the Tea Party movement by the media.
See also 
- Chomsky, Noam, "What makes mainstream media mainstream", October 1997, Z Magazine, 
- dailykos.com, "MSM" vs "Traditional Media", August 8, 2007
- CBS News (cbsnews.com), "Sarah Palin: Obama's Policies Are 'Un-American'", April 14, 2010, 
- Politico (politico.com), "Sarah Palin trashes 'lamestream media'", 11/18/09, 
- Los Angeles Times,"'Tea party' protesters in Nevada target health law, Reid", March 28, 2010, 
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