Facebook and social media in general is already horrible as is, why would you want to infect academia with it as well? The community does have a lot of issues but a social network and more blog posts are not the solution.

The traditional way is to organize meetups in the way of conferences, workshops, symposia, etc. It has a number of issues since some labs can't afford sending students or postdocs overseas and some countries are disadvantaged (for geographic or visa restriction reasons) but the organizers are usually well-aware of it and e.g. give out grants to cover expenses for students who apply for it.

I think the onus is on English speakers to reach out for the hidden knowledge out there, and not for the majority of the community to adapt to the native English-speaking minority. Right now they don't feel challenged because Anglo-Saxon univeristies are pretty much 'where it's at' and European ones more or less follow suit, but with the rise of Chinese research the situation may be about to change.