Investors and analysts will keep their eyes focused on Facebook as it releases earnings after Tuesday's closing bell.

It's been a strong growth story for the social networking giant, but some analysts have been expressing concerns about a slowdown. Last quarter, the company itself cautioned investors not to expect the same amount of top-line growth in the second half of the year.

Ad sales have been the main revenue driver for some time, so just how much more can Facebook grow? Quite a bit, according to Mark Mahaney, an analyst at RBC Capital Markets.

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On Monday, Mahaney said on CNBC's "Squawk on the Street" that the company still has several revenue drivers that will add to growth. "You have these upcoming catalysts, new revenue streams like autoplay video ads, Instagram monetization, and people are going to want to buy the stock before that starts rolling out and it's rolling out in the next three to six months," Mahaney said.

Carolyn Everson, Facebook's VP of Global Marketing Solutions, said mobile video advertising would be the headline story of 2015. She said mobile video consumption now accounts for 21 percent of total online video consumption, a big increase in the past few years.

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"Facebook offers the ultimate flexibility in online video advertising with the ability to offer both reach and targeting. Facebook is now capable of delivering a Super Bowl-size video consuming audience to a brand every single day," said Richard Greenfield, analyst at BTIG Research. "This will go one step further next month, when Facebook's Instagram launches video ads on its platform, with Instagram's usage actually growing faster than Facebook did when it was at this point in its evolution."