2, it may be the constant pursuit of new ideas in life, or it may be the inner inferiority, feeling ignored by people around, and trying to attract attention by constantly modifying the signature.
3. The signature of the circle of friends turned out to be a similar product introduction. Record your mood, state, life creed, etc. In order to be seen by others.
4, it may be for others to see, want others to see, after all, changing the signature is for others to see, or recording life.
5, the signature is not necessarily for others to see, sometimes it is for yourself, and the feeling may change. Actually, there is no need to care about those words.