Social media on Monday is buzzing about former Secretary of State Hillary Clinton's gay marriage shift.

In a 6-minute video for the Human Rights Campaign's (HRC) Americans for Marriage Equality campaign, Clinton announced that her stance on the issue had changed.

“I support marriage for lesbian and gay couples,” Clinton said. “I support it personally and as a matter of policy and law.”

(Related: Hillary Clinton: I support gay marriage.)

In 2011, Clinton told gay glossy The Advocate that she disagreed with her husband, former President Bill Clinton, on marriage equality.

“Well, I share his experience because we obviously share a lot of the same friends, but I have not changed my position,” she told the magazine.

While in her role as secretary of state, Clinton strongly spoke out in favor of LGBT rights, calling on nations to repeal laws which make gay sex a crime. She also cheered passage of a marriage bill in New York.

Reaction on Twitter was swift. Many comments suggested that Clinton's shift wasn't a shift at all, while others pointed to its political implications.

“I kind of forgot that Hillary Clinton wasn't already for gay marriage,” tweeted conservative columnist Josh Barro.

New York Post columnist and former presidential speechwriter John Podhoretz messaged: “What is this nonsense? Hillary already supported marriage in NY state a couple of years ago.”

“Here's a question,” NBC's Mike O'Brien asked his followers, “Will it be tenable for a Democratic presidential candidate to 'oppose' same-sex marriage in the 2016 primaries?”