Socialposter plugin allows you to send posts to following social networks: Facebook, Twitter and LinkedIn.

To use this plugin you need to have an account on https://mojo.seosamba.com/. And add your website to your account.

Use:

Click "SOCIAL POSTER" in "Admin panel", then click "Profile settings" or
go to your "mojo.seosamba.com" account, there you will find a link "[ configure social accounts ]" under "Social push" section.
You will be redirected to a page where you can authenticate your social accounts.

After you can post messages to Facebook, Twitter and LinkedIn from your website or from "mojo.seosamba.com".