"[Cities / social websites] might seem similar at a zoomed-out level, [however] the distinguishing characteristics and services of each city get amplified as one zooms in to the culture of the population and the various neighborhoods that make up each city."

"The biggest danger for any social media venture today, whether they be at the startup stage or even for those that already have a lot of traction, is to try to be all things to all people."

That's most intriguing.

It's as if to say, somewhere within the inner workings of a social website, there are (or ought to be) distinguishing niches.

Or, it could be that even though social sites are similar, there are those that just do what they do *better*.