Twitter is likely preparing to purge up to 10 million users from the app because they post too much porn, according to SunTrust Robinson Humphrey analyst Robert Peck and his team. Peck made the prediction in a note to investors ahead of Twitter’s April 28 Q1 earnings call.

A purge of that size would weigh heavily on Twitter’s stock, which generally gets punished by investors whenever it does not meet expectations for user growth. As Twitter grew users by only 14 million sequentially in Q1 2015, a purge of 10 million would crush Twitter’s numbers.

Peck is concerned because “basic searches” on Twitter produce results riddled with pornography, and he has seen some big name brands’ ads appear next to that adult content. Nielsen recently halted a Twitter ad campaign for this reason.

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