I found this valuable for those of us who are trying to implement their own PLNs from the ground up. They have compiled a Google Doc with all of the Twitter chats and hashtags to use to be involved in the conversations of like-minded educators. You can join the conversation now by checking out this document and using the appropriate hashtags http://tinyurl.com/29cn2uc
You can also Tweet right now to #Itnchat each Thursday to advice on how to use Twitter as your own personal PLN starting point.