Apple’s iPad may be alone at the top when it comes to tablet traffic, but some movement down at the bottom earlier this month is raising a few eyebrows. Barnes & Noble’s Nook Tablet has been a quiet success story ever since it first launched in 2010 as the Nook Color, and it looks like the eReader/tablet combo still has some fight left in it. Amazon’s Kindle Fire has garnered far more attention than its B&N counterpart since it launched late last year, but according to ad network Chitika, the Nook Tablet’s share of traffic across its massive network recently surpassed that of the Kindle Fire. Barnes & Nobles tablet was responsible for 20% more traffic than the Kindle Fire between June 4th and June 10th of this year, but the two are still fighting over scraps — Apple’s iPad claimed 91.07% of all tablet traffic during that period, while the Nook Tablet and Kindle Fire accounted for 0.85% and 0.71%, respectively.