Not really, I've had this discussion with many of my friends in my homecountry and generally speaking its really though to get any new friends when your in your late twenties+. University is a good spot, but after that there are not alot of situations where its natural.
How would you go about doing it? You cant "pick up" a same sex friend in a bar as you could with a girl. That would seem kinda wierd.
And by friend I mean someone you can casually call up at any time and ask if they wanna go have a beer, as the most natural thing in the world.
Meetups for ex-pats etc could work, but political stuff is better. When I lived in Denmark I joined the somewhat libertarian youth movement, mostly for social reasons, and that got me some aqueintances, and there is definitly going to be more of those in the States.
But personally I would still recommend Poland, as your sexual market value would be alot higher. And as soon as you have a girlfriend they come with tons of other friends, family-happenings and so on.