Why do girls like publishing so much?

That's what girls do! It should be vanity, and some of them are written for others. The more people comment on her, the more she feels that many people pay attention to her and care about her, and she will be happy. Some people simply take talking as a diary, just like keeping a diary. Some people are better at expressing their love, so they write to their dear ones to let them know how much they love him and how serious they are, for fear that the other person will feel that they don't love him.