Text messages are no better than facebook messages. Neither are likely to get you in trouble, but both should be avoided.
If you are going to communicate with someone about something illegal, use encryption.
For text messages, use Textsecure. It is written by great hackers and is really secure.
For email and other things like that, use PGP or the free, open source version, gnupg.
If you must use telephones, make a voice call. It is thousands of times more expensive to tap a voice call than it is to tap facebook or a text message, and they have to be watchin you in real time.
With facebook and text messages, they can search through your message history and find incriminating things that you said years ago. That's no bueno. Voice calls are infinitely less likely to be intercepted.
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