I do think that consumers would be better off with something like 100 MB of free data per month than an unlimited access to Facebook.

And I do think that Facebook wouldn't lose a lot compared to the current system. 98.41%[0] of the total social media traffic would still go to Facebook.

[0] I chose that percentage because that's the percentage for my country, with YouTube at the second place with .53%: http://gs.statcounter.com/social-media-stats/all/bosnia-and-...

I'm not even sure that Serbia has "free basics". It's a fairly well developed country with a 110% mobile penetration rate (last I checked, probably higher now), 4G and the prices are dirt cheap and affordable for the vast majority of the population.

Serbia doesn't. Other countries in this experiment (like Cambodia and Venezuela) do.

Cambodia, where the last independent newspaper was just shut down: https://www.newyorker.com/news/news-desk/the-devastating-shu...