The answer to your question is: Tornado Death Toll Rises to 68.
This is because all of the other headlines are opinions.
Ex. It will boost your confidence: opinion. Could or could not boost your confidence.
Best prank of all time: opinion. They think it's the best prank, but it's probably not.
Scandal spreads like wildfire: opinion. This one is a little tricky to pick between fact and opinion, but the reason it's opinion is because they are using a simile to describe what is happening and they are thinking it is spreading so fast, but it's probably not.
Hope this helps!!