How to send message on facebook from own site in Php(joomla)

I am importing contacts from facebook in joomla and trying to send message from my site using user email Id , but it is not sendi开发者_运维技巧ng messages.Please Help...

If you are trying to send email to the user's friends, that's not possible as answered here:

Send private messages to friends

You might not have setup the email settings properly on the joomla backend. If this is the problem then you can look at this post to setup Joomla so it can send out emails:

http://www.katcode.com/joomla-setup-smtp-email-capability-using-gmail-smtp/