Sending private messages to facebook accounts using ruby on rails

I need to make the user able to send private message to his friends through facebook. In PHP there is somethin开发者_如何学运维g called Openinviter which can grab the contacts of nearly any social network or email provider.

I found a gem on rails called contacts that does the same thing for email providers. It can grab users friends from email providers but not social networks.

Is there a similar gem or plugin that I could use to make my application send private messages to facebook contacts?

Thanks,

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You can use Facebook Chat API to send private messages, here is an example in Ruby using xmpp4r_facebook gem:

sender_chat_id = "-#{sender_uid}@chat.facebook.com"
receiver_chat_id = "-#{receiver_uid}@chat.facebook.com"
message_body = "message body"
message_subject = "message subject"

jabber_message = Jabber::Message.new(receiver_chat_id, message_body)
jabber_message.subject = message_subject

client = Jabber::Client.new(Jabber::JID.new(sender_chat_id))
client.connect
client.auth_sasl(Jabber::SASL::XFacebookPlatform.new(client,
   ENV.fetch('FACEBOOK_APP_ID'), facebook_auth.token,
   ENV.fetch('FACEBOOK_APP_SECRET')), nil)
client.send(jabber_message)
client.close

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No, sending private messages via email you've fetched from facebook's API or from a facebook app via the API seems to be against the current API TOS/Policies has in effect.