Alexis Madrigal: Photo galleries an 'invisible poison' to news sites

"Readers may click through your slideshow, but they'll hate you a liiitttle bit more than they did when they got to the site. ... You can get a page view spike that's actually a negative for your brand. And the more the slideshow spreads because of a clever headline or just because the topic is hot, the farther that brand damage spreads. Congratulations! You juiced the stats with an invisible poison!"