I created a document where I compared an open PLC (Discovery Educator Network) and a closed PLC (MCOE Professional Learning Community). It is interesting to see the differences. Here is the document: https://docs.google.com/document/edit?id=1BYFYz1pIsNWTf2LZwIDyDvVVO09Dq0rQcamiWSh2fvw&hl=en&authkey=CIeErPgB