[imaginology]

But you are part of a very tiny proportion of users smart enough to realize this. And it doesn't address the issue of someone sending private (or incriminating) messages to you, which would still link you as a "person of interest". If I send you a message containing the word "bomb", for example, that could get both our accounts flagged.

[planb]

Incriminating stuff can be sent to my mail address unencrypted. So I don't even have to use any proprietary messenger to be 'flagged'.

[briandear]

That's correct. If a terrorist calls your phone -- even if it's a wrong number, you're part of the spider web.