Ever seen a flash mob? A huge group of people does something in unison in public, from coordinated dances to Michael Jackson’s “Thriller” to freezing in place in the middle of Grand Central station. They’re offbeat and fun and kind of ridiculous.

Well, here’s your chance to be part of a flash mob that doesn’t require weeks of preparation: a super-long conga line. If you can handle walking in a line and following the person in front of you, then you’re already prepared! And the best part is that it’s for a good cause: privacy awareness and the National Network to End Domestic Violence (NNEDV). You’ll find event details below.

Where and when is it?

The line is happening on Tuesday, 5/15/2012 in both New York City and San Francisco at 11:00 AM EDT and PDT, respectively.

The starting address for the New York line is City Eventions, 1333 Broadway, New York, NY 10018.

The starting address for the San Francisco line is the Prescott Hotel, 545 Post St., San Francisco, California 94102.

What do I get for showing up?

We’re donating $1 to NNEDV for everyone who shows up (up to 1,000 people). We’re also donating $1 for every online share of our Facebook page poll and tweet of the #GoPrivate hashtag (up to $1,500). A lot of our customers have survived domestic violence, and staying private online is a really important part of their continued safety.

We also have 1,000 t-shirts to give away, 500 at each location. Here’s the design:

What’s the message behind the conga line? What’s the point we’d be making?

Our message is that Facebook’s going public, but you don’t have to; there are some simple things you can do to get the benefits of Facebook without leaving your data exposed. Here at Abine, we enjoy Facebook and use it every day, but support Facebook users having more control over their personal data. If you agree, we’d love to have you come out and join us to have some fun and help educate people about how their data is collected online and what they can do about it.

We’re directing people to our website at Abine.com/GoPrivate where we have an interactive calculator that determines your yearly value to Facebook, as well as tips and how to’s for navigating Facebook’s 7,000-word Data Use Policy and privacy settings.

And all I have to do is walk in a line?

Yep, that’s it! You’ll put on your free shirt so you look like the rest of the line, and then you’ll follow the person in front of you when the line starts moving (dancing is welcome). The people in the front know the route. A few Abine people and event coordinators will be on hand to give out shirts, keep a count of you for donation purposes, and make sure the line doesn’t walk into traffic.