How about I deleted my Facebook account years ago because employers started looking up people's accounts, forcing people to friend them as a condition for employment.

How about I deleted my Facebook account years ago because it's incredible foolish to have your real name and any personal details on the internet for public consumption.

How about I deleted my Facebook account years ago because there isn't any meaningful conversation on there anyway and most people are just posing for the camera.

How about I deleted my Facebook account years ago because some crazy friend of a friend passes masses of ridiculous propaganda all day long.

How about I deleted my Facebook account years ago because it allows people to tag my name in photos they took that I don't want publicly available.

How about I deleted my Facebook account years ago because I don't particularly want to be a product.

How about I deleted my Facebook account years ago because I don't particularly care for Zuckerberg.

I could go on and on.

Unless, if you don't log in after X months/centuries it's completely removed, but I don't see why FB would do that. Apparently, according to what I've read here, even people without FB accounts have FB accounts (shadow profiles).