Tesla ( shares jumped Monday afternoon after Elon Musk, CEO of the electric-car maker, ) tweeted that there was a "Really exciting @TeslaMotors announcement coming on Thursday."
"Am going to put my money where my mouth is in v major way," Musk tweeted, potentially alluding to a new project or round of investment for the company.
A Tesla spokeswoman declined to provide further information on the planned announcement.
Shares closed at $37.51, up 2.4%, after having jumped to $38.40 shortly after Musk's tweet.
There are some risks for executives who use social media to talk about their companies. In December, online streaming service Netflix ( revealed that it was )facing investigation from the Securities and Exchange Commission because CEO Reed Hastings had posted information about the company on his Facebook ( page. )
In a post on July 5 of last year, Hastings said that Netflix customers were viewing more than 1 billion hours of video content a month. The post was widely reported and Netflix stock rose 13% that day.
Musk is an active presence on social media, with over 167,000 Twitter followers. He made headlines earlier this year when he responded to a negative review of Tesla's Model S in the New York Times with a detailed blog post challenging the article's veracity.
A serial entrepreneur who co-founded PayPal and also heads the commercial space exploration firm SpaceX, Musk has already invested a portion of his own fortune in Tesla over the years to help the company grow.
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