I can remember such a time for Google. I can even remember such a time for Microsoft, back when people stayed in line for Windows 95. I was 13 back then and got my first computer.
Sure, investors were pleased with Facebook's rapid growth and people liked it because its UI didn't suck like MySpace. But Facebook has always been morally bankrupt due to its leadership and this has been visible for quite some time.
In our country we have a saying that applies perfectly: a fish rots from the head down ;-)
Richard Stalman has a page documenting Facebook's wrongdoings and it's pretty good: https://stallman.org/facebook.html