add link to Facebook group

[web/altusmetrum] / index.mdwn

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@@ -19,11 +19,9 @@ or compatible licenses.
 # Hobby Rocketry #
 
 The motivation for the circuits and software you will find on this site is
-our loosely-knit group's shared interest in hobby rocketry.  Rather than 
-try to introduce the hobby to you here, here's a very brief 
-[Ted presentation by Steve Jurvetson]
-(http://www.ted.com/talks/steve_jurvetson_on_model_rocketry.html)
-that will give you a quick flavor of what the point is.  John Coker 
+our loosely-knit group's shared interest in hobby rocketry.  This very brief
+[Ted presentation by Steve Jurvetson](http://www.ted.com/talks/steve_jurvetson_on_model_rocketry.html)
+quickly conveys at least part of why we do this.  John Coker 
 has published an excellent 
 [overview of hobby rocketry](http://www.jcrocket.com/welcome.shtml) 
 on his web site.  Keith has also put together some useful notes about the 
@@ -81,7 +79,9 @@ learn a lot and see some great flights by showing up at a club launch.
 
 As we make progress, you can read about it in our [News](News) feed.
 We also hang out on IRC channel #altusmetrum on irc.oftc.net if you have
-questions that aren't answered here.
+questions that aren't answered here.  And if you're a Facebook user, you
+can join the [Altus Metrum](http://www.facebook.com/group.php?gid=341167482968)
+Facebook group.
 
 Our main projects include radio links.  If you don't already have one, 
 getting an [Amateur Radio](./Radio) license would be a good thing to do!