Talking about politics on social media something that not everyone likes to engage in but the truth is that, social media is an avenue where you can air your view.
Now, in terms of this Italian politics you in question, i guess Facebook and others are great platforms to convince people for them to see reasons why should not give massive mandate to the racist party.

Polical thought written on the social media sometimes cause bad fights, bad words, violence's sentences

Am quite sure that you are right here but on a second thought, i also think that it depends on manner in which its presented.
But in all, everything politics must attract friends and foe at the same time.