Very interesting question.
Unlike his (many of his current) followers, Jesus didn't go around saying "I love you" all the time. He also didn't constantly say "you're going to hell" and he never started a conversation like that.
I think he would post something like this:
Blessed are the humble AT peeps, for they're the ones people won't flame.
Blessed are the peeps who are sad, for they're going to be comforted in the long run.
Blessed are the posters who say what they think without flaming, for they will inherit the forums.
Blessed are those in P&N who strive to truly speak and behave uprightly, no matter their political party, for they will succeed.
Blessed are those who continue to try to help the YAGT posters, for they will be helped in their problems.
Blessed are those who go through the forums daily and walk away untainted, for they will be able to face Truth.
Blessed are the people who can put an end to flamewars, for they will be respected by the forums for who they are.
Blessed are those who stand strong in what is true, even in the face of flames, for the Truth will be theirs.