Yeah, I know. I've set up a bunch of rules for myself, I'm taking this seriously. There's always the safety net of "well why did you listen to some random jackass on twitter" but I'd genuinely prefer if it never came to that. For example, I never say anything in the medical realm without also saying "ask a doctor/dentist". (There was that girl worried she had overdosed on a particular painkiller, I told her "even without obvious symptoms, liver damage may already be occuring, see a doctor right away", and she said "nah i feel alright I'm probably fine". At some point you gotta wash your hands of idiots, it's not like I can force her to go to the hospital.) Also, I don't deal in sex stuff, beyond telling people that they should never force themselves or let themselves be forced to do anything they don't want to do in that domain, and that openness and honesty are the most important things.
And I don't give out legal advice of course. Well, one dude once asked for advice because he had texted while driving and he was going to court for it, and I figured "the man's asking on twitter, he just needs the real baseline stuff" so I told him to dress nice and be polite because the last thing he wants is for the judge to dislike him. Then he asked "I'm in the Royal Navy, should I wear my uniform?" Which gave me an opportunity to exercize my "if I don't know, I don't make shit up" rule. I mean, I could see it ending in one of two ways: either the judge thinks more highly of him for being in the military, or he thinks "look at this jackass bringing shame to our fighting men, he thinks he can get away with crime because he's in uniform, I'll crush him like a bug". So I told him I had no idea and suggested he ask a superior.
Deep down, most people already know what's good for them; what they really need from a stranger on twitter (if they need anything at all) is a bit of self-confidence, encouragement to do the right thing, or occasional hard fact. In some cases I'm practically a google proxy, but I think sometimes folk just want to get the info from a live human being, and it gets me to learn a thing or two myself.