Users from lower-income countries tend to be a lot less valuable to advertisers. But which platform you’re on matters a lot, too. Just this week, Reddit said its revenue was booming thanks to AI-powered ads. Pinterest shares, meanwhile, are sinking this morning on the exact opposite — AI’s influence underwhelmed investors. At Snap, it was the same story, with shares diving 17% on Wednesday as the company is somehow barely growing while its peers leap forward. For all three of those companies, the average revenue per active user (ARPU) was about $2.40 to $2.80 a month for a user in the US or North America. (They define their geographies slightly differently.) So, not a whole lot to split them.