Only one condition, you must have your own Facebook Application!
So, you can post as many as you like (according to the number of friends you have), but the important thing is to set the "App Domain" of your application into "blogspot.com".
Don't have your own Facebook Application?
Create one! :D
If you don't know how, you can read it here
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FAQ, How-to, Caranya Gimana?
