I don't think social networks are "evil" because of malice. They're evil because of our flaws as human beings. Of our biases. Social networks just amplify and exploit the way we think so mostly negative thoughts and emotions get amplified in an ever-expanding echo chamber [1] We get angrier, more polarised, more isolated in our tribe and cliques. If there has ever been an instrument of the Devil himself to sow discord on this planet, this is it.

1: https://www.youtube.com/watch?v=rE3j_RHkqJc