in the context of human behavior, whether or not to inform your friends about getting a new job is entirely up to you and depends on your relationship with them and your personal preferences.
Some people may choose to share the news of their new job with their friends, especially if they have a close and supportive circle. Sharing such news can be a way to celebrate your achievements, seek congratulations, and receive well-wishes from friends. It may also help strengthen your bond with them as they share in your happiness and success.
On the other hand, some individuals might prefer to keep their professional life separate from their personal life and might not feel the need to inform their friends about their new job. It's entirely acceptable to maintain a level of privacy and only share such information with a select group of people, such as family members or very close friends.
Ultimately, the decision to share news about your new job with friends is entirely personal. Consider your relationship with each friend, your level of comfort with sharing personal information, and how you think your friends will react to the news. If you're unsure, you can always share the news with a few close friends first and see how it feels before deciding whether to tell others.