LinkedIn Plugins are a way to drop LinkedIn functionality into websites.
Widgets. Bring Out The Best. Highlight your strongest content with a StumbleUpon Widget on your site. Get going in just two easy steps. Start Now - Its Free!
Google+ platform websites integration using the Google+ platform tag.
The Tweet Button is a small widget which allows visitors to share content and connect on Twitter.
Let visitors recommend your content on Google Search and share it on Google+.
A web page. Every web page is implicitly assumed to be declared to be of type WebPage, so the various properties about that webpage, such as breadcrumb may be used. We recommend explicit declaration if these properties are specified, but if they are found outside of an itemscope, they will be assumed to be about the page