Plugin to share about your old posts on twitter, facebook, linkedin to get more hits for them and keep them alive.
Connect your WordPress site to Buffer and share/re-share your old and new Posts/Pages/Custom Post Types to all major Social Media Networks
This plugin allows site owners to automatically schedule and reshare their content on Twitter and increase social traffic without lifting a finger.
Send WordPress Pages, Posts or Custom Post Types to your Buffer (bufferapp.com) account for scheduled publishing to social networks.
Plugin that automatically tweets your old posts (including custom posts) which helps you increase the traffic on your website.
WP Linkpush Buddy allows blog posters to use Linkpush services directly from their WP Add New Post form.