Well, everyone gossips sometime, right? We complain to a friend about someone at annoying at work or moan to our partner / mum / sister about some perceived slight, it can be cathartic and put things into perspective.
But I have seen up close that some people use gossip as slander and it works amazingly. I have been victim to this myself at work. In one job, I had a great rapport with all my coworkers and managers and was on track to be given a permanent contract. I went on holiday for 2 weeks and when I came back I had lost the trust of my senior co-workers, and people treated me differently, much more reserved. I was heavily criticised for something minor (like I hadn't done the travel booking using the correct procedure, with no ill effect). People who I had considered close colleagues avoided me. It turned out that a woman who I was friendly with had raised concerns about my work and talked with all the key people I was working with and gained their trust while I lost theirs. It became so untenable that I resigned just before I was going to be given a permanent job. BTW, I've never had any dramatically negative feedback in any single job before, and this was 100% manufactured.
I have seen this sort of thing play out at the school gate as well and it is always, without exception the gossipy destroyer of reputation who comes out as the 'winner'.
How does this work? What is the psychology at play here? Why is gossiping so effective? I want to say "it's not fair" but know that's childish. But it's a bit shit though, right?