Common Tag, a new meta data tag that supposedly adds even more semantic web value to your pages, was launched on June 11. A community pet, adopted and developed by many web companies (including AdaptiveBlue, Zemanta, Freebase, Yahoo! and Zigtag,) Common Tag allows site owners and administrators to further structure content with HTML, creating the tags we use to make our blog entries, online videos and crazy pictures from Memorial Day more identifiable to our friends, family and the searching public.