How about introverts?

There is a ton of meetings, happy hour get togethers, and all sorts of parties going on. They are all geared toward the extroverts and those who really enjoy being out in the midst of it all in large parties, expanding their network of "friends" et. al.

But what about all the introverts: those who don't enjoy mingling, going to parties where there are a ton of strangers, where the norm is to do a lot of small talk and no chance of getting to know the real person who seems to be enjoying her/himself holding onto that glass of wine or beer? Those who don't make "friends" as easily as extroverts, but when they do the relationship is normally stronger, those who rather enjoy small groups of strangers and getting to know them beyond the superficial small talk, and build relationships that goes deeper than being acquaintances?

There are differences between extroverts and introverts in all the cultures we come from, but life in the US seems to sharpen the contrast in available opportunities for introverts viz-a-viz those available for extroverts.

What do you suppose is the way/venue for introverts to expand their network of friends esp. here in the US?