Just as a counter to this, consider something like linked in. Suppose you innocently get a new job, and it doesn't work out pretty quickly (e.g. within a month

Just as a counter to this, consider something like linked in. Suppose you innocently get a new job, and it doesn't work out pretty quickly (e.g. within a month you realize it was a huge mistake). Suppose you also marked this job on your linked in. Now you have to ask yourself if linked In is selling this private information to new employers about this recent bad-role. Also, there are firms that sell info to your employer about you updating your linked in (because it may mean you're looking to quit). So it could affect your career negatively, even if you're super happy and don't see the effects directly.