There are many pages on Facebook dedicated to some aspect of micronationalism, apart from those belonging to individual micronations. However, as you might expect, few of them are regularly active with a reasonable number of members, so we have just added one page, Micronationalism, to our Resources section.
Micronationalism on Facebook
06 Tuesday Mar 2012
Posted in Site News
Micronations News Network 
Thanks, I’ve added that to the list.
If you are looking for others to add in the future, the Micronations and Alternative Polities group would be one I’d recommend. It’s pretty active and is used by a good number of people who frequent MNN.
http://www.facebook.com/groups/micronationsandalternativepolities