Oct 10
11
Google introduced parameter handling last year to help SEOs manage duplicate content (e.g., session IDs, source, language). Parameter handling allows SEOs to view which parameters Google thinks should be ignored or not at crawl time, and to overwrite Google’s suggestions. On Friday, Google announced that webmasters now have the ability to choose a specific value among the known values for a given URL parameter
Excerpt from:
Google Webmaster Tools Update: Better Parameter Handling