There are some activities which, at least in my view, are done in groups rather than alone... Seeing a movie or eating at a restaurant are two activities that I personally attribute with a "social group" -- in other words, I'm used to doing these things with at least one other person and notice if I do it alone. One of the things I've that stands out about New York City is that the sight of a person eating alone at a restaurant is more common here than elsewhere.
Maybe I'm specifically looking for this, now? I don't think so -- so far every time I eat in a restaurant that isn't around Times Square, there's a few people dining solo. This isn't me passing any sort of judgment -- I'm writing specifically because I got sushi today at the Noodle Cafe Zen after dropping by the Strand Bookstore (needed to get my fix of sci-fi novels).
Coupled with the fact that rumours keep circulating about New York City having the highest proportion of single people, I'm starting to wonder if this city that has something to offer for everyone, is really a bit of an introverted or lonely place? Nothing wrong with being alone, of course, and my views as someone who (a) doesn't live in the city itself, and (b) has been here for just over five months are a bit biased.
Or maybe it's just how people prefer the city? I must say, I spent the whole day alone today, mainly working but also getting a fix of sci-fi books and sushi, and must say I am completely happy with how things turned out.