I am on my Ning too and just added Twitter as a tab at the top. Did you do that? It is so cool! You should make a hashtag for your spanish group like #vmspanish and then everytime they talked about your class it could be used. :) I love Nings!
I LOVE Diigo! It is awesome! I am going to teach 3rd through 7th how to use Diigo next week! I am really excited. I showed the 4th graders today and one boy said "You mean I won't have to bookmark on my computer anymore. It will follow me everywhere?" It was great! You need to install Diigolet to use while bookmarking, annotating, highlighting, and sharing your bookmarks and then you would LOVE it! You should come to a 1st hour class next week for the elementary when I am presenting. We will be in the MacLab. :)