Bill Ackman's first tweet is about Chipotle, a company his hedge fund Pershing Square has taken a big stake in.

It is his first tweet since he launched the Twitter profile late in June. The photo was taken at a Chipotle restaurant on 56th Street in Manhattan.

Chipotle's stock dropped on Tuesday after Business Insider's Hayley Peterson broke the news that a restaurant in Virginia had closed due to food poisoning. The stock closed down 5.51%.

On Tuesday night, Jeff Gundlach, the founder of DoubleLine Funds, added his voice to the criticism of Chipotle on Twitter.

Gundlach tweeted: "Should CMG expand menu to get customers back?" Raw Egg Breakfast Burrito, anyone? Oh well, bulls have that 0% dividend going for them, anyway!"

(Markets Insider)

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