Links to facebook.com:

Site #1: http://www.facebook.com/stepp

Site #2: http://www.facebook.com/

Site #3: http://developers.facebook.com/

Links to CS.Washington.Edu:

Site #1: http://www.cs.washington.edu/142/

Site #2: http://www.cs.washington.edu/143/

Site #3: http://www.cs.washington.edu/154/

Site #4: http://www.cs.washington.edu/

Links to Google:

Site #1: http://www.google.com

Site #2: http://mail.google.com/