Why do all websites change recently?

[Hi Lol]

YouTube has changed ENORMOUSLY in the past year, and it did not evolve, did not become more helpful, it's just cr@p. Yahoo answers has too.
And now: Facebook. Are you owner people losing your minds?? - yeah, ok, yahoo answers is just good, but facebook? What do you think is behind all of these changes?

[PokerPlayer]

I don't think 2 sites counts as all websites.

[Thalia]

Well I think they're trying to improve and failing. I mean, think about it. When you sign in now, they give you message saying something along the lines of "Check out our new ___ system! It allows you to ____"
Youtube has this new google+ cr@p and it's just soo annoying. But youtube is his huge company who doesn't have TIME to see their user's rants. They just think they're being helpful.

[NUM63R5]

People want to attract more people and think that changing the layout/format things will be easier to manage. The thing is people already get accustomed to the way things look so when it changes it doesn't feel good. Facebook sucks and it will always be. It's more of a place to stalk or whatever. It's always changing btw.

Yahoo answers is the one that surprises me, because if it ain't broke don't fix it!