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In many cases, when browsing the Web, users are searching for specific information. Sometimes, though, users are also looking for something interesting, surprising, or entertain- ing. Serendipitous search puts interestingness on par with relevance. We investigate how interesting are the results one can obtain via serendipitous search, and what makes them so, by comparing entity networks extracted from two promi- nent social media sites, Wikipedia and Yahoo! Answers. PAPER ACCEPTED FOR THE WWW2013 CONFERENCE (www.2013.org).