An historical perspective, whilst interesting, is neither here nor there: the time is now!
Social networking was shown to have little effect at the last election, all it did was reaffirm 'group-think' in the same way as happens in clubs, pubs and the workplace.
Giving votes to 16 - 17 yr-olds has nothing to do with fairness, minority, majority, taxes, work or marriage. It is being discussed because most of the parties want to stay in the EU and they think that most young people want that as well.
It is a temporary insurance policy to fix the vote and although I intend to vote to stay in I want the result to be fair: either way.