Headline: "Bing Gains 10% Marketshare"
Wow, you might think, Bing gained a delta of 10% market share? That's quite a lot!
The article reveals that Bing gained market share for a final total of 10%. That is very misleading. If I say "Tom gains 150 pounds", what would you intrepret that to mean? By this usage, it would mean he gained a few pounds to reach a total of 150.
Here's another example from the slashdot blurb:
That's a gain of two large points in five months.
Oh, these are "large" percentage points? That must be a lot more impressive than two "small" percentage points. What about the five months -- are they large or small?