First there were Hippies and Yippies. Then there were Yuppies and Preppies. Along came GenXers and and BoBos. Now, here come the Grups. Never heard of them? Don't look now: you might even be one. At the very least, you know some of them and are called to minister to them. Regardless, you need to read Adam Sternbergh's article in the New York Magazine to learn all about this remarkable sociological and cultural phenomenon.