Overfamiliar (kyori nashi)
Overview
"Overfamiliar" (kyori nashi, literally "no distance") is a slang term for a person who treats others with a familiarity that doesn't match their relationship, or for that behavior itself. Talking in a casual tone the first time you meet, asking private questions before you are close, and acting like a best friend soon after meeting are all called overfamiliar.
Overfamiliar people don't necessarily mean any harm. Sometimes they simply can't judge the right distance in communication. But to the person on the receiving end it comes across as unpleasant, and it leads them to think "I don't want to deal with this person."
Overfamiliarity in a question box
A question box is also an environment where overfamiliar behavior happens easily. Because they are anonymous, senders find it hard to keep their relationship with the person answering in mind. Someone who just followed asks "Do you have a boyfriend?" or "How much do you earn?" Someone sending their very first question writes "I always see your posts, I love you."
Overfamiliar questions are hard for the person answering to deal with. Ignoring them can make you seem "cold," and answering them doesn't mean the overfamiliarity will stop. Turning them down politely can also get you called "no fun." Overfamiliar senders often don't realize that what they are doing is making the other person uncomfortable.
What the right distance looks like
A good guide for the right distance in a question box is "could I ask this to someone I just met?" If it's a question you could ask someone you're talking to for the first time at school, it's likely to be accepted in a question box too. If it's a question you wouldn't ask on first meeting, it's better to avoid it in a question box too. Being anonymous doesn't change the rules of distance.
If you are the person answering and need to deal with an overfamiliar question, one way is to say frankly, "That question is hard for me to answer." You don't need to get angry, but you don't need to accept it either. Showing your boundaries is part of running a question box in a healthy way.