How does Wikipedia stop false information from being posted?
We Wikipedians frequently “patrol” pages and give them a once-over – and if we see something that is obviously vandalism or false (e.g. Gerald Ford being alive) we will revert these edits by changing them (using our User privileges). We also can use programmes that can be downloaded and used (only with a certain edit count) to combat vandalism seconds after it happens. However, nothing can be done to stop people from posting these bad things, but we Wikipedians strive to make sure that such stupidities are removed quickly and efficiently and we remove the vandalism as fast as we can Hope this has helped, S.O.