Earlier quoted context omitted.
Better data is over a longer span of time.
I'm not sure what you're saying. StatsCounter (the source of the data) reported that Bing was briefly a more popular referral than Yahoo, but that the trend has now reversed. If you don't trust the June 4th data, I can't see how you can then accept the June 6th/7th data. The time span over each day is exactly the same.
I wonder if their CPM will go down as a result of all this hype-cycling.