FB and Instagram DEFINITELY suck battery.I only briefly had the iPhone 12 and it drained super fast. My oldest daughter has a 12 Pro and complains of fast draining. She came from an XR. My 12 Pro Max lasted a long time on a charge though. I think it’s a combination of the 5G modem being power hungry on 5G and some of the batteries being sub standard. Social media apps like Insta and FB and Reddit seem to put a strain on the battery according to my kids and husband. I don’t use social media apps so I don’t have those issues. Back in the day when I had FB it drained battery harshly.
They are probably running full processor chip speed and sucking as much data over cellular Wi-Fi as they can.
They are awful.
I only access FB through a browser (delete Messenger now for privacy and battery life), and Instagram I used to allow only sometimes throughout the day to reserve battery life, but I have it deleted on my phone too now (only access at home computer.
Google apps I don’t have except the Docs, and I don’t use it often (so don’t know about battery), but my spouse has gmail and is sucks her battery super quick.