Instagram, WhatsApp. Granted that these were acquisitions but they have nicely been integrated into their overall product suite.

And now their VR products.

I think consumers consider their glasses a solid product. They may have had the first successful version of the idea

They're "integrated" the way Adobe or Autodesk's acquisitions are "integrated," which is to say that they're not, in any meaningful way - but at least you only have to log in/get your credit card out once. And that's sort of fine, because they never needed to be integrated. All of the individual applications work fine on their own, with common media formats if you need to move between them. In fact, the acquisitions should have never taken place at all; they should have been blocked for antitrust violations.