Android: intent

http://miox.cc/2009/04/android-adb-shell-java.html
http://developer.android.com/guide/appendix/g-app-intents.html
http://stackoverflow.com/questions/14093509/log-into-facebook-app-using-am-start-commands-adb-shell

Broadcast intent
am broadcast -a android.intent.action.PROXY_CHANGE

Start activity
am start -n package/activity

[Note] You can use ddms/adb to check package/activity 
[Note] am start -a android.intent.action.VIEW -d fb://events