Comment by dymk

https://news.northeastern.edu/2014/10/23/ecommerce-study/

The actual paper: http://www.ccs.neu.edu/home/cbw/static/pdf/imc151-hannak.pdf...

"As shown in Figure 11, Travelocity alters hotel search results for users who browse from iOS devices." (In particular, alters the prices shown to the user).