"This crowdsourced resource is meant to help those who are just beginning to start their journey as a "connected educator." It is not exhaustive. In fact, if all goes to plan, it will be a perpetual work in progress - just like the PLNs it will hopefully help build.
... PLN is an acronym for Personal Learning Network. The acronym is relatively new, but the idea is not. Teachers have always had learning networks—people we learn from and share with. Teachers are information junkies. We’re also social. Put the two together and you have a personal learning network." from source: http://www.livebinders.com/