挂在脸上

'挂在脸上' (Hanging on the Face) implies wearing one’s emotions openly on the face. It can mean this person is straightforward, wears his or her heart on his or her sleeve, does not hide true feelings or reactions from people. They might laugh out loud in happiness or clearly display when they're sad or mad, which adds an air of genuineness and authenticity around the person using this kind of net alias.