Meetup.com rocks at email marketing! In this blog post I’m going to show you how they make money with their emails. You should walk away from this post understanding the power of personalized location based email marketing and how it can increase user engagement.

Meetup.com User Life Cycle Comic below
First the Basics:
What is Meetup?
So lets say you wanted to get a bunch of like-minded people to talk about books, web development, parenting, etc. You can go to Meetup.com and launch a “meetup”. You can also go directly to their site and search based on your interest and zip code for a meetup in your area.
How does Meetup.com make money?
Meetup.com charges the organizers a flat monthly fee ($19/mo) to run a “meetup”?
Note: that they don’t have a free plan or trial. Instead they explain why they need to charge and a picture of their entire team. They also try to incentivize you to sign up for 6 months rather than doing a month to month plan (this probably helps them increase retention since it takes 3-6 months to get your meetup really going).
Why would anyone want to run a “meetup”?
Lots of reasons. But here are a few:
Meet like minded people, recruiting, seminars, business development, build a small community. Oh… also you can charge people to attend your meetup so this can turn into your own business.
Now the Good Stuff. How they do email marketing:
It is meetup.com’s financial incentive to make sure people attend meetups. Organizers are likely to keep their meetup going if people show up.
Step 1: Incentivize the “Organizer” to market the meetup using their existing community and location.
Meetup tells the organizer to email their contacts, post flyers up, and publish an ad on craigslist in their city. This helps meetup.com reach new users.
Step 2: Automatically assign email alerts to the user based on the meetup they joined. For example I joined a board-game meetup and it assigned a bunch of tags for me based on that meetup:

The beauty here is not only do they know I’m into board games but they know that I’m also located in San Francisco. Now, whenever a new board-game meetup is created in San Francisco I will get an email alert.
Step 3: Ask the new user to update their interests. This is done in the app and each email alert they send out.
The more things meetup learns about you the better they will be able to fill up their new meetups by alerting users.
Step 4: When a new meetup is created alert the people that are interested in it. This will help organizers fill up their meetups and keep them as a happy paid customers.
So, What’s The Point?:
Community driven sites can increase retention by simply alerting customers via email when something of interest happens on your site. So ask your users what they are interested in and let them know when it happens.
comic art work by jenniart. feel free to reblog or embed this comic
If you have a community driven site and need help with figuring out how to make this happen just let me know in the comments or here. I would be happy to help you out. I’m also constantly tweeting about web marketing so feel free to follow me.
Update 3/23/11: Awesome quote in the comments by Ish
“Bottom line you are playing with fire with email alerts — make sure its clear to the user whats causing the alerts to happen and give them fine-grained tools to control them.”