Twitter has had discussions about acquiring Shots Mobile, the selfie-sharing app startup whose investors include pop star Justin Bieber, CNBC reported citing an anonymous source.

The social company, which is looking to fuel user growth and engagement, has been drawn by Shots’ user base, according to the CNBC report. Shots has more than 3 million users, with nearly two-thirds of them women under 24.

Shots co-founders — software entrepreneur John Shahidi and his brother Sam — have had meetings with Twitter over the past several months, according to a previous report by Re/code.

Twitter declined to comment.

Along with Bieber, other investors in Shots include venture capitalist Shervin Pishevar, boxer Floyd Mayweather and investor Tom McInerney.

The reports come after Twitter CFO Anthony Noto on Monday sent out a tweet — apparently intending it as a direct message to a colleague — that hinted at the company’s M&A plans.

“I still think we should buy them,” Noto wrote in the tweet, which was quickly deleted. “He is on your schedule for Dec 15 or 16 — we will need to sell him. I have a plan.” It’s not clear who Noto intended the message for.