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ClassParrot and Cel.ly
If I taught in a high school, I would definitely sign up for ClassParrot or Cel.ly. Both are services that allows users to set up a text group and then broadcast text messages to the group. Cel.ly seems to be more robust than ClassParrot.
For those of us who are stuck in the email generation, it’s hard to believe that texting is the primary form of communication of the mobile generation.
A similar broadcast could be done using Twitter, IF students had smart phones and regularly checked their Twitter feeds.