One reason this is the state of things now compared to early iterations of electronic communication is the replacement of public space (mailing lists and usenet groups) with privatized spaces (Facebook pages, blogs, Twitter feeds). Whether or not this is a bad thing, it means that there is no public square to have a fight over. Now it makes more sense, instead of having an argument to settle the matter, you just go start your own blog and attract like minded people.
I suppose this is just a particular incarnation of the more overarching transition from modernity to postmodernity. In the latter state, every community gets to have its own version of the truth, and there is no master narrative, nothing worth fighting over.
In some ways this is a good thing. The old-style intellectuals were arrogant and their testosterone-fueled contest to impose the One True Ideology or Philosophy or whatever had some unfortunate consequences. Yet something feels lost.