This article was in Mac OS X Hints and is a great way to add FaceTime icons to the desktop. One touch of the icon and your placing a FaceTime call to the person. I haven’t figured out a way to get the URL saved on an iOS device’s homescreen yet, but I hope someone will be clever and make that work as well. I’d love a folder of frequently called FaceTime calls.
Now that FaceTime has been released for the Mac, you can video chat with friends to and from your desktop or laptop as well as your iPhone. If you regularly chat with someone, Mac OS X Hints reader jcrossley has a way to create desktop shortcuts that will call that person on FaceTime:
appleid, [email protected], and phone# are the Apple ID, e-mail address, or phone number of the person you want to call, respectively. Now select that URL in the address bar and drag it to the desktop, That will create a desktop shortcut that, when double clicked, will open up FaceTime with your friend’s information already entered. Just hit the big green button to call them.
You can also use this trick to add one of these Facetime links to Address Book. Just open up Address Book, go to Card > Add Field in the menu bar, and hit URL. Paste the FaceTime link into the URL section, and save the contact. Now, to FaceTime with that person, you can just navigate to their Address Book card and hit the link under the URL entry.
Source: Mac OS X Hints