Some Things are Better Left Unsaid
People have also become too casual about revealing details that might better be kept under wraps, driven by the notion that sharing intimate details creates a sense of intimacy between people. While that can be true, it can be taken too far.
Topics to avoid: detailed health problems, sex life, problems with a spouse, personal finances, religion, politics, the personal lives of other coworkers, gossip about the boss, extravagant purchases, or off-color jokes.
It also seems to create an expectation of reciprocity: since you've told someone the details of your private life, they are expected to tell you the same in return - and they may not be comfortable in doing so. When the shoe is on the other foot, bring the subject to a close before it goes too far.
In the end, there is a balance to be struck: to refuse to discuss your personal life at all may be interpreted as being impersonal, but being too open makes you seen indiscreet and unprofessional.
EN: There are cultural difference is the degree to which persons should attempt to "connect" with colleagues on a personal level. Some prefer a disconnected, impersonal approach, others feel that connecting on a personal level establishes trust. In the end, this is a gray area.