First and foremost, do you even Pin?

Pinners--both active users and investors--are going to be watching as Pinterest (PINS) reports its first earnings as a public company after the bell Thursday. 

Jeff Marks, senior portfolio analyst with Jim Cramer's Action Alerts PLUS investing club, weighed in on what he's watching when Pinterest reports earnings. 

"So what everyone's going to be looking for is how they monetize that and the metric you're going to want to pay attention to there is ARPU or average revenue per user. If they can keep the FDA can get that number growing, that'll really show signs that they're monetizing the product and now be encouraging for investors," said Marks. 

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