The contents of the chat messages are e2e encrypted, so meta can’t see what you are sending.

But they can see all of the Meta data, ie how often you chat with someone, how often you send pictures/videos/voice messages, etc.

That is more than enough to know everything about you and your friends.

The optimal solution is to add a small heatpump in addition to a gas heating

He probably realized that millions of people blocked him and it hurt his ego.

You don’t own the actual image since that would be too big for the block chain. You only “own” a URL that points to the image. The host can delete that URL or change the picture behind it any time they want.