The problem is when you have reports stating that the plane flipped over when that clearly did not happen. Crowd sourced news will not always be accurate, and can also lead to crowd based vigilantism such as happened during the Boston attack and the aftermath on Reddit.
While traditional media often relies on sensationalism and also use these same sources of information during broadcast, this is not an ideal method either.
That's why you have to build fact-checking in. Reports did say the plane flipped over, but there were pictures on Twitter showing it clearly didn't. If you were shown both of those reports at the same time it would be obvious what the right answer is.
Also, it's worth noting that mainstream media was reporting the plane had flipped over as well, so misinformation isn't solved by the current solutions.
While traditional media often relies on sensationalism and also use these same sources of information during broadcast, this is not an ideal method either.