I'm too scared to anonymously post something on the internet.
what are you thinking to post?
I'm thinking to anonymously post related to gay porn on my Facebook wall.
While you should be able to post what you like, posting porn is too much. You are exposing people to sexual things in casual conversation when they are not expecting it. It might trigger something in them if you do so.
But my friends are pressuring me to post it.
It is hard to stand up against peer pressure but you should do it when what they are asking you do is wrong. You might upset the other people in your life and cause you to lose them instead.