I asked the group a while back why Greenify has such a good rep while what I consider to be similar (not exactly the same) app killer type apps have horrible reps (as an entire type...not just single apps in that group). I really didn't get any answers I thought were enlightening, and found with my own use that Greenify at best did nothing positive for me.
Seems like non system apps are greenified properly, and system apps are not. Facebook was installed as system on my phone. So that explains it. The other apps, no idea. I just turned off all of the greenify stuff except for Forced Doze to get rid of the app killer function.
You can still use your browser for FB and not lose much functionality at all. I'd say the main thing I do miss is being able to share articles or pics directly from their apps. Given the resource hog that the Facebook app has always been, its worth the trade off to me.
I just tried it on my tablet. For some reason Spotify premium won't log in without the Facebook app. Honestly apparently it's not Facebook that's draining my battery. It's the actual connection. I blocked background data and while battery usage dropped somewhat, it still is quite a jump. Turning the data completely off is the only thing that fixes my odd battery consumption.
And uploading or sending pics via the browser version creates compression. Which is bad for my needs.