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U.S. officials urge Americans to use encrypted apps amid unprecedented cyberattack
(www.nbcnews.com)
This is a most excellent place for technology news and articles.
And external services provide this as well, like those services where you can find deleted comments (or the internet archive).
I just try to disassociate my identity as much as I can from sites like Reddit. I never used my email on Reddit, and I haven't used mine here. I'm guessing an enterprising individual could triangulate who I am based on my posts (though I do post false information sometimes), but that's a lot less likely than if I handed over that association (i.e. through Facebook or whatever).
Do what you can, but yeah, assume that everything you post on the internet exists forever.