Chart of the day: Apple's iPad and the 13 dwarfsJune 24, 2013: 12:07 PM ET
The iPad's share of tablet Web traffic edged up in May. The others are going nowhere.
FORTUNE -- Based on Web usage, the tablet market in North America still looks like Apple and the 13 dwarfs.
The chart above was posted Monday by Chitika, a mobile ad networks that runs about 4 billion spots per month across 300,000 websites in the U.S. and Canada and -- shades of the N.S.A. -- collects metadata on some tens of millions of tablet Web impressions.
The charts below show how that usage has changed over the past three months.
Link to the full report: May 2013 Tablet Update.