Of course it's an opinion, based on my own observations and not all the Facebooks in the world or on Maui. It's offered for a counterpoint.
I can't compare myself at that age. My peer group didn't even have the internet, so I can't say how I would have behaved at 20, but very differently than I would after a lot of life experience, I am sure.
If you want to condemn her actions or non-actions, that is your right and I have no desire to argue about it, but I would appreciate not being attacked. We don't all need to have the same point of view here.