Things are moving quickly in the world of social media. A week ago, Musk said he would like to see some changes at the micro-messaging service. He became the largest individual shareholder when he bought a 9.2 percent stake in the company. He started polling users about new features and got approval from the CEO.

Musk is a member of the Board of Directors.

I'm excited to announce that we're appointingelonmusk to our board! It was clear to us that he would bring great value to our Board after talking with him.

He is both a passionate believer and an intense critic of the service which is exactly what we need to make us stronger in the long-term. Welcome to the world!

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Musk said he was looking forward to working with the board to make improvements to the site.

The move, announced less than an hour ago, has already inspired thousands of meme, but despite the funny side of it, it is an important move for Twitter, which has often been criticized for not moving fast enough. Time will tell whether Musk is a good or bad thing, as things will probably start happening more quickly with Musk on board.

The official website of the company doesn't list Musk as a member of the Board, but we're pretty sure he's serious about this. They must be, right? Right?

The SEC filing confirms that Musk is a member of the Board. As a member of the Board, Musk is forbidden from buying more than 14.9% of the stock.