I have just watched the latest Sherlock. The chances are good that if you live in the UK, so have you.
You know how first videos, then DVDs, then the multiplication of channels and on-demand telly internet replay thingummies killed off the simultaneous collective experience of television?
It’s back. Not, I hasten to add, that I would know anything about Twitface from personal experience, but there are plenty of people nowadays who simply must watch Sherlock or Dr Who live so that they can talk about it on the internet the minute it is over.