The problem is, there's too much they're trying to show you. They can't fit it all, and users would get bored quickly if they tried. If I saw everything my 300+

The problem is, there's too much they're trying to show you. They can't fit it all, and users would get bored quickly if they tried. If I saw everything my 300+ "friends" on Facebook did every day, plus everything every page I followed said, plus everything that's recommended, plus every ad they wanted to show all shown in the same order they were posted in, I'd be scrolling for five minutes and only be a few moments back in time. And for other people, they'd look at it once a day, and the next day might be exactly the same. So what's the point in visiting constantly? It's done to hide how active or inactive your social graph actually is.