Online behavior changed the world in amazing ways, indeed. Early in Internet times, a Rebetzin refused to have her family photo online for a shul. now, everyone is instagramming. Maybe, it is not an ayn hara anymore when there are more people posting than reading.
As to flaming, it existed in early online groups even with full names. I don’t think people understood that this is going to be a permanent record. Luckily for them, old search results are on page 10.’