FaceTime added to Dock on Start Up
Solution 1:
Remove them from your dock, then go under the go tab in finder to your hard drive, then to library, and then in the prefences folder find com.apple.dockfixup.plist and move it to the recycle bin. Problem solved. This worked for me and I am running Lion so, hopefully it will work for you...
Solution 2:
This could be caused if your machine is managed -- more accurately, if your machine connected to an open directory server. Or perhaps to a OS X lion server, managing your machine's preferences.