Why do people chat with you under your post (or in a group) but don't talk about you privately?

There are three main reasons why someone sends me a message to reply to me under my confidences, but never talks about me in private.

First: there are not many people coming and going on weekdays.

Although they are friends of their own, such friends are either classmates or colleagues who haven't contacted for a long time after graduation, or friends whom they hardly know, but who have been added by QQ. In this case, because they are not familiar with each other, they won't rashly ask you this and that, but they can see your dynamics and what you send, and if they have a certain noise about what you send, they will leave a message under your speech to express their views or ask something. They never expect your reply. Of course, if you have it, just say it. If not, it doesn't matter.

Second: They are interested in what you published.

Talk about your inner world, which is the emotion you want to express at this moment. If you publish any advertisement or buy or sell something, I believe no one will reply to you below. Someone will reply to you because they are interested in your topic, either what happened around them or what they did, so I will leave you a message and chat with you.

Third: prove your existence.

Sometimes, others leave messages under your confidences just to prove their existence, because they are your friends and two people are friends of each other, but it is always bad to never confide. I always want to prove my existence, so I will improvise and find some words to leave a mark under your talk.

Under normal circumstances, those who send messages below, but never talk privately, are basically these three situations.