If the movie 2001: A Space Odyssey were released in 2010 versus 1968, the classic line above may have been followed by a click-through to read reviews.  Let's find out why.  Over the past year, Google AdWords has introduced a number of ad extensions that enable advertisers to provide additional information about their businesses and products. For example, product extensions, location extensions, ad sitelinks, and phone extensions are all now available to advertisers.