Introduced in Tiki6, this feature incorporates the "Tell a friend" and promote features into something more general, which allows sending messages to Social Networks, as well as internal messages or forum posts to alert on some wiki page in your Tiki site, etc.
Enable the Feature:
Admin home > Features > Global Features > Additional > Share
To access: Click the Share icon on the Admin Panel
or Access http://example.org/tiki-admin.php?page=share
Set it up in the Share admin panel:
Once enabled the feature, all pages will have a new icon on the top right corner, to allow the user to share this page with others:
Once you click there, you will be offered some options to share the page with, depending on the associated features (internal or related to external social networks) which are already enabled and configured in your site.