Social media has led to a social gaffe for Steve Martin, but he's taking full responsibility for his racist tweet and explaining in detail how it came about.

The actor, writer and former Oscar host, 68, was quipping with fans on Twitter when he apparently went too far when the topic turned to grammar.

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Steve Martin is under fire for tweeting a racist joke and offending many of his fans on Twitter, though he did delete it himself and apologize immediately.

The actor/comedian was having some fun on Twitter, answering questions about grammar rules, in what is one of his usual hilarious social media routines.

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