How its according to Islam to start using face book again? Or to boycott it permanently?

People are entitled to their opinions of Islam... Facebook understands that. Time for muslims to grasp the concept their religion is not the only one... and they do not command how others think and act.

Perhaps you would enjoy it if the non-muslim world decides to boycott any and all things Muslim or from Muslim nations. How would that be any different?

I think anything is not bad but its use makes it bad or good. The same applies to Facebook.