I think there's an irresponsible way (the lying way) and a responsible way to use Wikipedia, wherein you'll achieve minimum lie factor. The wrong way is to go to a page once, and then assume everything that there is factually accurate. Always check the sources cited down at the bottom. A ton are just other people's websites. So, those, more or less, can only be considered true with a modifier like "it has been put forward over the internet that" and the like, or by checking any sources cited by that site. A good thing to do, if you find something that you think is vandalism, is to refresh the page. A lot of those disappear immediately. And if "Bill Clinton is a baby eater" is still there, you may want to wait an hour or more.