I am trying to text from my new IPad2 and some of the contacts names turn red and won't allow me to send. Why?

I am trying to text from my new IPad2 and some of the contacts names turn red and won't allow me to send. Why?

The recipients have to have an apple device and an apple id.
about messages
http://support.apple.com/kb/HT3529
Troubleshooting messages
http://support.apple.com/kb/TS2755

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