I guess? Alphabet had a good quarter.

Alphabet broadly allows Google to continue-on as Google, in the event that Waymo or its other broader subsidiaries fail (and conversely, allows Google to be cut if that part starts to die). Alphabet is probably one of the most tactical "renames" out of the bunch.

Alphabet isn't quite the same thing, though. They kept the Google name around, and created Alphabet as a kind of holding company. This way they retained the value of their brand while also getting to have a kooky company with a fun name.

There is still a big blue F on facebook.com and the app. It doesn't seem that different to me.

Facebook used to mean two things - Facebook.com and the Facebook mobile app - The company Facebook which owned the two aforementioned products, instagram, messenger, whatsapp, oculus, portal...

The second item here was rebranded to Meta, but the Facebook site and app are still Facebook. It's just the overarching company is Meta

Facebook hasn't gone away. I get that it's not literally a child company under the parent Meta, but the product is still very much alive and is not going anywhere

But how are their fundamentals? Their potential for future growth?

Google is a behemoth, and I wouldn't bet against them. I wouldnt buy their stock either