If you've got (or are thinking about getting) Google Apps for Education, then you need to see this. Nice site that was announced at ISTE this year (2010)
This is where your PLN can be of great help. I konw that you're not yet sold on Twitter, but I also know that Twitter is perfect for continued professional growth
This tool was mentioned in chapter 8 of Blogs, Wikis, Podcasts... It looks great and "provides free storage and free bandwidth for your videos, audio files, photos..." It also claims to provide "Universal access to all knowledge."
and we are already hearing about "Facebook addiction"
For education, FB or a site like FB would be like one stop shopping at Wal Mart. Announcements, pictures, email, video, games.
I prefer getting and sending messages in my FB mail than having to go to my yahoo mail and for posting videos than using my youtube account- I can do several things in one place. It is a lot easier to post pictures on FB then to send through email, especially a large group of pictures.