A continuación comparto con vosotros una série de URLs customizables para compartir contenido:
twitter: http://twitter.com/home?status=[TITLE]+[URL]
facebook: http://www.facebook.com/share.php?u=[URL]&title=[TITLE]
Tumblr: http://www.tumblr.com/share?v=3&u=[URL]&t=[TITLE]
Digg: http://www.digg.com/submit?phase=2&url=[URL]&title=[TITLE]
StumpleUpon: http://www.stumbleupon.com/submit?url=[URL]&title=[TITLE]
Delicious: http://del.icio.us/post?url=[URL]&title=[TITLE]]¬es=[DESCRIPTION]
Google Buzz: http://www.google.com/reader/link?title=[TITLE]&url=[URL]
Google Bookmarks: http://www.google.com/bookmarks/mark?op=edit&bkmk=[URL]&title=[title]&annotation=[DESCRIPTION]
Linkedin: http://www.linkedin.com/shareArticle?mini=true&url=[URL]&title=[TITLE]&source=[SOURCE/DOMAIN]
Slashdot: http://slashdot.org/bookmark.pl?url=[URL]&title=[TITLE]
Technorati: http://technorati.com/faves?add=[URL]&title=[TITLE]
Posterous: http://posterous.com/share?linkto=[URL]
Reddit: http://www.reddit.com/submit?url=[URL]&title=[TITLE]
Newsvine: http://www.newsvine.com/_tools/seed&save?u=[URL]&h=[TITLE]
Ping.fm: http://ping.fm/ref/?link=[URL]&title=[TITLE]&body=[DESCRIPTION]
Evernote: http://www.evernote.com/clip.action?url=[URL]&title=[TITLE]
friendfeed: http://www.friendfeed.com/share?url=[URL]&title=[TITLE]
Evidentemente tendréis que substituir [TITLE], [DESCRIPTION] y [URL] por los datos correspondientes (ya sean literales o códigos PHP).