That one person you know on Facebook. Typically a guy who will comment on a hot girl's Facebook status writing an essay long defense against someone who may have said something offensive. This is only a means to get the attention of the hot girl when in reality that person is just some loser behind a computer with no social life.
Girl status: "OMG, totally had a bad day. Nothing is right :("
Random person: "You always complain. Go kill yourself"
Knight in cyber armor: "This is uncalled for! It's hurtful and rude. I apologize if I hurt your feelings, but I'm not going to tolerate anyone being attacked with something like this. You're posting personal jokes on a public forum, you can't expect everyone to sit silently. If someone were attacking you, and it they meant what they said, wouldn't you want someone to step in? I would. So I did."
You (in your head): "Oh here we go. Another knight in cyber armor trying to save the day . News flash: At most, you'll get a "like" from your mom and will still be a virgin behind a computer."