Some time ago (a year or so) I made a google search to see how many links do I had to my site. I remember that back then I had a few links from gamedev.net forums, because of my signature. I repeated the search this week and all gamedev.net links seems to have dissapeared. Does google removes old links? Also, I have been posting links to my blog posts in twitter, but I dont see them listed in my links by google. Can somebody confirm me if google counts twitter links or just indexes the twits ignoring links? Perhaps it is because of bit.ly url shortening?