Because of the Jersey Shore Nickname Generator, I can tell with certainty when MTV starts advertising a new season of Jersey Shore because my web traffic jumps by about 25% immediately. When the show starts airing on Thursday nights, traffic jumps even more. By this index, MTV started advertising Jersey Shore on July 25th.
unlikelywords.com 
Google Trends says you’re pretty close:
http://www.google.com/trends?q=jersey+shore&ctab=0&geo=all&date=mtd&sort=0
Looks like there was also a big spike when The Boston Herald posted the results of a poll about the show.
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