Sale or no sale, changes could come to Twitter users

NEW YORK (AP) -- Sale or no sale, Twitter users are bound to see changes as the beleaguered communications service tries to broaden its appeal to more people and advertisers.A new owner could clean up Twitter and curb some of the nastiness that's become synonymous with it. Or perhaps a new owner would just show more ads. Or let it languish while it mines the best of what Twitter now has into its existing products and services.All of this is speculation, of course, and there might not even be a n