I come out of the postrationalist scene, which is largely folks who came up reading rationalists but think the framework has seriously blindspots w/r/t language, culture, art, social games. Rationalism is traditionally a little more New Atheist (there are network connections between the subcultures) whereas e.g. postrationalists are more likely to point out ritual & religion's social benefits, to worry about the cost of rationalizing society, to cite James Scott's Seeing Like A State, etc. The names of these subcultures are a bit grandiose, really we're just talking about folks between age 20-40 who hang out on a handful of websites and blogs—in postrationalism's case, Ribbonfarm is the major touchstone.