I always monitor website, blog, myspace etc., hits and compare them to the royalty statements as they arrive to see if any correlation exists between them and my efforts (the downside of an engineering background) so I've no doubt I'll post something if any trends develop.
My experience so far suggests that dwell time on the publisher's front page is the most significant factor, with everything else, reviews, contests, excerpts, etc., following so far behind as to be inconsequential.
This may mean I'm doing things wrong...or nothing, and the current effort is to find out more.