A.) With a little discernment and common sense you can cull the talking out of their tooskie's from the people who have solid information.Heaven forbid anyone want substantive proof.
B.) Those who know things aren't going to publicly put out for consumption who they are getting their information from or they will no longer be getting said information.
Nothing wrong with wanting a solid source but it does get tiresome when someone is consistently dropping you a gift of knowledge and the reoccurring question is "how do you know this".