The links were provided by Joel Josephson and posted on the Facebook group of EU_Educators: Two European projects that are are addressing the needs of Greek and less widely used and taught languages (LWULT).
1) GLOSSA – Greek as a vehicle for promoting linguistic diversity http://www.ellinikiglossa.eu/
on Facebook: http://www.facebook.com/ellinikiglossa
2) Sun.Com – informal language learning networks: http://www.sun-languagecommunity.eu/
on Facebook: http://www.facebook.com/pages/SuNCom/193803417327967