Girls usually change their personal signatures, hoping to update and change their image, or express their mood or state at a certain moment. Specifically, girls may modify their personal signatures, which I hope the following people will see:

1. Friends and relatives: Girls may want their close friends and family to see their new signatures and let them know their current situation and thoughts.

2. Potential suitors: If girls are looking for new relationships, they may modify their personal signatures to attract the attention of potential suitors.

3. Colleagues and leaders at work: If girls need to show a professional image at work, they may modify their personal signatures to show their professionalism to colleagues and leaders at work.

Generally speaking, when girls modify their personal signatures, they usually want to show their new images and ideas to a specific group of people, which depends on their motives and purposes.