They ll post social security numbers, credit reports, addresses, and photos. Whatever they can find. The Internet is a giant playground and melting pot. Conflicts, which would normally occur in a small town environment, now occur on a global scale. Every possible view is represented in this global medium.
Every view now has the opportunity to meet with a conflicting view in a way like never before.
It is possible to state an opinion about anything and unearth a fanatic with an opposing opinion. More conflicts are bound to happen. Just like schoolyard bullies made your life miserable in 5 th grade, someone like that is now an adult waiting to cross your path. When you were young you wished for invisibility. To sneak past that bully, to be invisible to him so he focused on someone else.