Yahoo! is taking its cue from … well, from everyone, and adding a whole new social aspect to its site.Sure, there already was e-mail and IM and a customizable home page, but now you can display your activity on/from many of your other social sites to your Yahoo profile.There are a slew of options – photos from Picasa, SmugMug, Webshots and Zooomr;  StumbleUpon, Furl and Ma.gnolia bookmarks; blog posts from Blogger, Bloglines, Travelpod, Tumblr, Vox and Xanga;  Last.fm and Pandora music playlists;