I was reading another story-identification question, when this suddenly popped into my head. I'm pretty sure it was a TV series that I saw being advertised about six years ago. The basic premise was that there was an implant that gave you a wireless Internet connection in your brain. I don't think there was an overlay in your vision, hyper-fast brain processing, or anything like that, more that you could do a search query at the speed of thought, with much the same issue of search engines today where the results may not be the absolute truth. Anyhow, it becomes one of those things that everyone has to have, with only the poor and a few opposed folk opting out, right up until the beginning of the series, when suddenly everyone with the implant dies, leaving a much-reduced population. I didn't actually get to watch it, just see some ads, so I don't really know how the plot turned out, although I have this vague idea that India was a main focal-point, either because they had a substantial population that did not have implants (because they couldn't afford the technology / surgery) or because almost everyone had them (because the government had subsidized it).
I have a vague idea that much of the plot involved a combination of figuring out how to survive with so many people involved in infrastructure dying, and trying to solve the mystery of what happened to kill everyone, and if it was an accident or an intentional act. I also think it was a short title, one or two words. I don't think it lasted more than a season or two.
I will, of course, add more details as I can recall them.
