The web is known for connecting people with diverse interests, typically in chat rooms, message boards and other online venues. But in the case of Meetup, the gatherings take place in the real world of bowling alleys, cafes and bars. In fact, without Meetup, a slick online tool for organizing local groups, lots of gatherings would never take place. You’re into Elvis? The Atkins diet? With hundreds of topics listed, from atheism to yoyos to golden retrievers, Meetup will help you find others who share your enthusiasms and obsessions, whatever they may be, and hang out with them.