No platform is the practice of of preventing someone — either through policy or through protest — from spreading their ideas through a particular event or website. The term is mostly used to refer to rescinding an invitation to someone asked to speak at an event (such as a guest lecture at a college). The concept apparently originates from a policy used by the British National Union of Students to prevent people they disagree with from giving speeches on UK college campuses. The concept is similar to the political action of cordon sanitaire, where a politician or political party is either unconditionally excluded from coalitions or other forms or cooperation, or even completely ignored. “No platform” is typically invoked for issues such as racism, sexism, homophobia, Holocaust denial, and so forth. As what is and is not acceptable by society changes with the times, so do the targets of “no platform”, with 2015 seeing protests of speakers seen as transphobic or Islamophobic who consider themselves progressive as they are feminists or atheists, respectively. No-platforming is, at best, an attempt to prevent a balance fallacy, with protesters refusing to allow tacit endorsement of reactionary views. ~ “No platform,” RationalWiki, as of 8 August 2018.
If “no platform” is your modus operandi, have I got a platform for you!