Get rid of facetime, misson control from mac on every start in 3 steps

Step 1) cd /Library/Preferences
Step 2) sudo vi com.apple.dockfixup.plist
Step 3) Locate unwanted startup items and remove them , save the file and exit it and restart ur machine

Happy 'mac'ing
              <dict>
                        <key>after</key>
                        <string>begin</string>
                        <key>path</key>
                        <string>/Applications/Mission Control.app</string>
                        <key>tile-data</key>
                        <dict>
                                <key>file-type</key>
                                <integer>169</integer>
                        </dict>
                </dict>



                <dict>
                        <key>after</key>
                        <string>/Applications/Mission Control.app</string>
                        <key>path</key>
                        <string>/Applications/App Store.app</string>
                </dict>


                <dict>
                        <key>after</key>
                        <string>end</string>
                        <key>group</key>
                        <integer>80</integer>
                        <key>path</key>
                        <string>/Applications/Server.app</string>
                        <key>server</key>
                        <true/>
                </dict>

                <dict>
                        <key>after</key>
                        <string>/Applications/iChat.app</string>
                        <key>path</key>
                        <string>/Applications/FaceTime.app</string>
                </dict>