Anti Chick-fil-A protesters hold signs outside a Chick-fil-A fast food restaurant, 1 August 2012 in Hollywood, California
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Gay protest at US fast-food chain Chick-fil-A

Supporters of gay marriage in the US have been protesting at outlets of a fast-food chain, in response to its owner's opposition to same-sex unions.

More than 13,000 people said on Facebook they would be attending "National Same Sex Kiss Day at Chick-fil-A" on Friday.

However, supporters of Chick-fil-A boss Dan Cathy have also gathered outside the restaurants, after he backed the "biblical definition of a family".