How to post messages from my Facebook App to users (exact users or all) who signed (likes) my App?
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How to post messages from my Facebook App to users (exact users or all) who signed (likes) my App?
My suggestion is Koala gem which satisfy your needs and you can also verify the Facebook Graph API.
Koala Gem Github
Read the graph API wiki in koala gem. Here you will find how to write a post in users wall. For getting FB App users list you have to read FB graph API documentation.
P.S: Read the koala gem wiki completely.