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Always assume they can and will identify you in real life. It doesn’t mean give away your real name, just act accordingly.
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Things that are legal now may not be legal in the future. Or in other places. Online interactions are not except from this rule.
I wince when I hear people talk about putting everything on signal. It’s like, you know if your using Google keyboard on Android, Apple devices, servers to transfer the data, and many others are listening in.