The api looks alot like tsung. I'm almost willing to bet that either they got inspiration from it or are using it on the server. Anyway, tsung is great and these services are great too.
if you look at the 'your data - your results' piece of the carousel, it has a log which has 'pid' as a column and, e.g., '<7038,69,0>' as a value. So you're probably quite right.
