-- Search Engine Spider and User Agent Identification
---- ia archiver
motorhaven - 1:35 am on Jul 15, 2012 (gmt 0)
It shouldn't impact Alexa rankings. Alexa builds ranking based on hits from browsers with the plug-in installed. I blocked it for years on a site in the top 10,000, and several other sites with no negative change in Alexa rank (and wouldn't care if it did!).