Good things too add into a persuasive anti Facebook speech?

[I Love Dogs!]

It's quite addictive and can take time away from outside activities.

The photos you post up can be used by Facebook for advertising without you knowing.

You may think that it's being social, but chatting online develops no social skills or friendships whatsoever. Talking on the phone or meeting up and chatting is much better for mental and emotional health.

Many problems can occur from friends having arguments and bringing it onto Facebook. Suicides have occured.

Remember to start your speech with a bang. Something that'll catch people's attention.
Use lots of eye contact and facial expressions. Also vary the tone and pitch of your voice throughout the speech.

Good Luck!