Is it necessary to watermark the little red book shared by friends?

Because the advantages of watermark are that it can let readers see who took the photo, and it also reflects the photographer's self-affirmation and self-confidence. It is also a means of mounting works, just as a good calligraphy and painting must be signed or printed, it can also prevent others from using it at will.

It can better protect the copyright of pictures, but some platforms will automatically mark the platform or mark the watermark generated according to the author's platform name.