As of Tuesday, the three biggest public social media companies have reported earnings for the latest quarter, and all three reported slowing or declining users on their respective platforms.

Snap reported a drop in daily active users on a quarter-over-quarter basis for the second quarter. Facebook reported a drop in monthly users on a quarter-over-quarter basis for European users, while North American users were flat. Twitter posted a small decline in monthly users on a quarter-over-quarter basis.

This sudden shift in user behavior may indicate that we've hit "peak social." As in, we've topped out on social media growth and there's no room to add new users. Facebook and Twitter cited the European Union's new privacy law, GDPR, as contributing to declines. Snap blamed its recent Snapchat redesign, which drew criticism from celebrities and millions of users. (Snap eventually redesigned its redesign.)

There's also emerging markets to consider. China has blocked its billions of mobile internet users from Facebook and other popular sites for years. Facebook hasn't quite given up on entering the Chinese market yet. But it's banking on "lite," or pared down, versions of its apps to saturate huge unaddressed markets like India, Nigeria and Indonesia.

The slowing growth — even if limited to North America — may also indicate that Facebook, with its suite of social apps, has tightened its grip on the space. The Silicon Valley giant said in July that 2.5 billion people use its family of apps each month.

Instagram's numbers are still strong. While Facebook doesn't break out specific numbers for the photo-sharing app, the company announced in June that it had reached 1 billion monthly active accounts. (That's accounts, not users, because a user can have multiple accounts.)

And WhatsApp, which is popular outside the U.S. as the go-to encrypted messaging service, is putting up Facebook core-level numbers. Facebook CEO Mark Zuckerberg said on the company's fourth-quarter earnings call in January that WhatsApp crossed 1.5 billion monthly users.

Executives haven't offered an updated count in recent quarters, but COO Sheryl Sandberg said on the most recent earnings call that WhatsApp status — just one feature of the larger app — draws 450 million users each day and surpasses daily users for Instagram Stories.

Anyway, here's a look at the charts. You can decide if we're in peak social.

Facebook is still on a nice upward trend for its monthly active users overall.