What are some alternatives?
GroupSpaces - Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
OkCupid - OkCupid Free Online Dating - The fastest growing free dating site for singles.
Basecamp - A simple and elegant project management system.
craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.