Jay Holtslander

<a href="https://wpvulndb.com/plugins/structured-data-test-button" rel="nofollow ugc"></a>
Adds a “Test Data” link in the admin bar (when viewing any page or post) which opens the current URL in <a href="https://search.google.com/structured-data/testing-tool" rel="nofollow ugc">Google’s Structured Data Testing Tool</a>. (You must have the admin bar enabled to see it.)
<h3>Introduction to Structured Data</h3>
Structured data markup describes things on the web, along with their properties. For example, if your site has recipes, you could use markup to describe properties for each recipe, such as the summary, the URL to a photo for the dish, and its overall rating from users.
When you provide structured data markup for your online content, you make that content eligible to appear in two categories of Google Search features:
<ul>
<li>Rich results — Structured data for things like recipes, articles, and videos can appear in Rich Cards, as either a single element or a list of items. Other kinds of structured data can enhance the appearance of your site in Search, such as with <a href="https://developers.google.com/search/docs/data-types/breadcrumbs" rel="nofollow ugc">Breadcrumbs</a>, or a <a href="https://developers.google.com/search/docs/data-types/sitelinks-searchbox" rel="nofollow ugc">Sitelinks Search Box</a>.</li>
<li>Knowledge Graph cards — If you’re the authority for certain content, Google can treat the structured data on your site as factual and import it into the <a href="http://www.google.com/intl/es419/insidesearch/features/search/knowledge.html" rel="nofollow ugc">Knowledge Graph</a>, where it can power prominent answers in Search and across Google properties. Knowledge Graph cards appear for authoritative data about <a href="https://developers.google.com/search/docs/data-types/corporate-contacts" rel="nofollow ugc">organizations</a>, and <a href="https://developers.google.com/search/docs/data-types/events" rel="nofollow ugc">events</a>. <a href="https://developers.google.com/search/docs/data-types/reviews" rel="nofollow ugc">Movie reviews</a>, and <a href="https://developers.google.com/search/docs/data-types/tv-movies" rel="nofollow ugc">movie/music play actions</a>, while based on ranking, can also appear in Knowledge Graph cards once they are reconciled to Knowledge Graph entities.</li>
</ul>
<a href="https://developers.google.com/search/docs/guides/intro-structured-data" rel="nofollow ugc">Learn more</a>

Structured Data Test Button

I made this plugin

Adds a “Test Data” link in the admin bar (when viewing any page or post) which opens the current URL in Google's Structured Data Testing Tool.

Piyush Mishra

The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook to enable any web page to have the same functionality as a Facebook Page.
While many different technologies and schemas exist and could be combined together, there isn’t a single technology which provides enough information to richly represent any web page within the social graph. The Open Graph protocol builds on these existing technologies and gives developers one thing to implement. Developer simplicity is a key goal of the Open Graph protocol which has informed many of the technical design decisions.
<h4>For Developers</h4>
Use <code>add_action('open_graph_head_pre','your_function');</code> and <code>add_action('open_graph_head_post','your_function');</code> to edit the meta data. For an instance of the class.
Always use <code>open_graph_instance()</code> 
Read more on the Plugin URI > <a href="http://www.piyushmishra.com/plugins/open-graph.html" title="Plugin URI" rel="nofollow ugc">Open Graph WP implementation</a> or check out the FAQs

Open Graph WP implementation

Implements the Open Graph Protocol on a WordPress installation. Can be used by other plugins as a dependency.

Structured Data Test Button vs Open Graph WP implementation