Whether you define a niche as 0.5% of the population or as 5% of the population is not important. Google doesn't do 0.5% and it doesn't do 5%. It only does stuf

Whether you define a niche as 0.5% of the population or as 5% of the population is not important. Google doesn't do 0.5% and it doesn't do 5%. It only does stuff that is potentially useful for almost everybody (with a few exceptions that are targeted at IT professionals). I don't know exactly what the potential of Reader might have been. Maybe something between 1% and 3%? It's the same ballpark as Twitter in my view, but that is admittedly rather speculative. It's also not the point I was trying to make.