Somewhere in the mercato thread. It was a big need when it was placed.
You need to understand (actually, you were right here). We had people posting all kind of crappy news from bs sources like sportmercatoweb and goal.com and people tought they were real, mixed with people who just posted plain bad news.
Rules changed that you get a direct ban if you are posting fake news during the mercato, and you should always mention the source.
After this, there has become a culture, where news from Mark for example really stood out cause it came from the good sources. Currently we are making fun of that english bloke from express.co.uk. Well 2 years ago that would have been accepted as a source