So http://Meetup.com is
They own all meetups & if y'all decide to take a rest for a bit they allow a new admin to join & take over 
woah what? But they charge money! What's it for then, the privilege of administrating one *their* meetups? - ugh
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
woah what? But they charge money! What's it for then, the privilege of administrating one *their* meetups? - ugh