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I was having the same issue with my Thunderbolt and removing the "+1" did not solve the problem.
UPDATE:
I went to the Verizon store and they confirmed that it was an issue with the "+1" on the Facebook integration. However, just removing the "+1" did not clear out the number from the messaging history. In order to fix you must delete the entire message thread. I did so, checking the option to delete "locked" messages as well, and was able to send texts to the numbers that were causing me issues before.