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The chart is meaningless. Having a colorful image makes links to the post look more appealing in Facebook, G+, Pinterest, etc.

These days, you pretty much have to put a pretty picture in an article if you want traffic from social sites.

As far as this dude, with his aging eyeballs is concerned, the colour's meaning, if any was irrelevant.

I mean, the information was interesting enough to me to try to read it, but I frankly can not parse what looks like #FFFFFF text on #FEFFFE background.

For the love of god, If you want to present data like this, ensure at least a little contrast exists between the text and background

Kurt and Jessica just had a lot of time on their hands.