Strange
When I've been forced to use Facebook I don't find the interface "addictive", I find the interface *intentionally* obtuse and annoying. Why is it, when you click on a notification in your drop-down, the Faceplant app often DOESN'T take you to the post it notified you of, it (intentionally) drops you into your general feed. Which means you have to scroll past other posts to find the one you wanted - that's not " addictive", that's intentionally "obscure" in order to force to view things you didn't really give a crap about.
Lots of other things can be pointed out, as well. If "addictive" means you have the attention span of a goldfish and everything shiny put in front of you grabs your attention, then I guess it's "addictive".
What the interface really is, is "excessively spam-filled", intentionally filling your view with things that they want you to spend your time and attention on even if you don't give a rat's ass about any of it. It's the ultimate ad server, trying to draw you into caring about their feed. You can ignore it but that doesn't remove the incredible annoyance of its very existence. It's walking into a shop and getting bombarded with flat-screen TV's all running at full blast.
That isn't called "addictive", just "abusive capitalism" - must be me. Take some personal responsibility and put the damn phone down if you feel it's addictive, you know that's possible, right?