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In a comparison of Twitter accounts, FollowerWonk shows something called Engagement % Rate.  I've looked but I cannot find any information about how this score is calculated or what it is based on.  Does anyone know?

Thanks!  So now I'm looking for an explanation as to why my weekly ranking report says that I'm not in the top 50...

iirusa.com and the page that ranks for innovation conference is iirusa.com/feiusa/fei-home.xml

Thanks for the suggestion, Cyle. It turns out it is the same URL from one week to the next.  I still have my ranking (phew!) but those 2 elements of the report are at odds with Google, and with each other.  If SEOmoz is reporting "no results in top 50" shouldn't they also be reporting "1 down" if last week the same URL was ranked #2?

I just received my weekly ranking report.  2 Up, 0 down, 8 the same this week.  However, last week my page was #2 for "innovation conference" and this week you report "not in top 50."  My first thought was penalty, but when I searched and removed personalization, we were still #2 for that search query.  So, something must be wrong with the report - either we're 1 down or "not in the top 50 is wrong."