I could obviously live without a Facebook account. My social life is just better with it than without it. Your circumstances might be different. The point is that everybody's circumstances are different so just because you don't derive value from a particular product or service doesn't mean that other people don't.

If you're going to be super-literal about the word "need" then we can include pretty much nothing other than water, food, and shelter as "needs." But we wouldn't have a very useful conversation if we did that.