In fact, I seem to remember they recently did... The idea was limiting the number of possible recipients of a message, and also limiting forward chains. That would seem a promising policy to stop the sort of mass-coordinated eruptions of violent emotions these products otherwise enable.

The second point is rather more subjective, but in my recollection, there was never a moment where there was a collective sense that the internet is of negative net value in the way that is the case for FB today.

When the internet was small, it was also unknown. At the time where it became part of the general dialog, it often came in the form of CompuServe and AOL. Those were rather sanitised walled gardens, and the obvious positive uses had front page billing in the average person's mind. Sure, there were lots of scare stories of porn and whatever, but I don't remember them ever getting close the far larger narrative of the dotcom boom.