Thanks! Not even a quick Google search could tell me the meaning.

You might wanna try DuckDuckGo ;-)

https://duckduckgo.com/?q=FAANG

Their search results aren't always better, but sometimes you might find some surprising features (e.g. direct StackOverflow results).

The acronym seems to change every few weeks. I saw another one all over the comments a while ago.

Friendster Alcoa AmerisourceBergen Nestle Glencore