larjen

A WordPress plugin that sanitizes tags in posts.
If you add the following tags to your posts they will be transformed like this:
<pre><code>"joe" -> "Joe" (capitalized first letter) "iMac" -> "iMac" (no change) "googletranslate" -> "Google Translate" (Transformed tag) "Wordpress" -> "WordPress" (small p changed to capital P) </code></pre>
It is also possible to alter the tag mappings from within the plugin controlpanel.

WPTagSanitizer

A WordPress plugin that sanitizes tags in posts.

Niall Kennedy

Twitter

Evan Sobkowicz

Embed Twitter content, improve sharing on Twitter, convert your web audience into Twitter or Periscope subscribers, and easily track visits to your website from Twitter advertising.
Requires PHP version 5.6 or greater.
<h4>Embed Twitter content</h4>
Embed Twitter content by pasting a URL, customizing a shortcode, or in a widget area.
<ul>
<li><a href="https://github.com/twitter/wordpress/wiki/Embedded-Tweet" title="single Tweet embed" rel="nofollow ugc">single Tweet</a></li>
<li><a href="https://github.com/twitter/wordpress/wiki/Embedded-Profile-Timeline" title="Twitter embedded profile timeline" rel="nofollow ugc">profile timeline</a></li>
<li><a href="https://github.com/twitter/wordpress/wiki/Embedded-List-Timeline" title="Twitter embedded list timeline" rel="nofollow ugc">list timeline</a></li>
<li><a href="https://github.com/twitter/wordpress/wiki/Embedded-Collection-Timeline" title="Twitter embedded collection" rel="nofollow ugc">collection</a></li>
<li><a href="https://github.com/twitter/wordpress/wiki/Moments" title="Twitter embedded Moment" rel="nofollow ugc">Moment</a></li>
</ul>
Customize embed display to match your theme. Choose a light or dark background, customize link and border colors, and customize timeline template components through your site’s WordPress administrative interface.
The plugin automatically customizes an embed’s template text to match the locale of your site, optimally loads Twitter’s JavaScript to improve site speed and extensibility, and handles advanced use cases such as articles loaded asynchronously via the WordPress API.
<h4>Grow your Twitter audience</h4>
Automatically generate link previews for your site’s URLs shared on Twitter using <a href="https://github.com/twitter/wordpress/wiki/Cards" rel="nofollow ugc">Twitter Cards markup</a> . Easily identify your site and author Twitter accounts through your site and user administrative interfaces.
Add a <a href="https://github.com/twitter/wordpress/wiki/Tweet-Button" rel="nofollow ugc">Tweet button</a> to public posts to encourage your visitors to share your content on Twitter. Visitors may see recommended accounts to follow after sharing your content including your site and its authors.
Add a <a href="https://github.com/twitter/wordpress/wiki/Follow-Button" rel="nofollow ugc">Follow button</a> to convert your site visitors into Twitter subscribers.
Add a <a href="https://github.com/twitter/wordpress/wiki/Periscope-On-Air-Button" rel="nofollow ugc">Periscope On Air button</a> to convert your site visitors into Periscope subscribers.
<h4>Improve Twitter advertising campaigns</h4>
Easily add a Twitter website tag to your website to track the effectiveness and <a href="https://business.twitter.com/en/help/campaign-measurement-and-analytics/conversion-tracking-for-websites.html" rel="nofollow ugc">conversion rates</a> of Twitter advertising campaigns or <a href="https://business.twitter.com/en/targeting/tailored-audiences.html" rel="nofollow ugc">build tailored audiences</a> to target your Twitter advertisements for your website audience.
<blockquote>
Docs and active development 
 Contribute to the plugin, submit pull requests, or run test suites through the <a href="https://github.com/twitter/wordpress" rel="nofollow ugc">Twitter plugin for WordPress GitHub repository</a>. 
 View <a href="https://github.com/twitter/wordpress/wiki" rel="nofollow ugc">Twitter for WordPress documentation</a> to learn more about customization through WordPress filters.
</blockquote>

Motivated by our love to twitter and its analytics we have launched a tool to complement this plugin.  https://wordpress.org/plugins/ki-twitter-analytics/ 

Analytics now available

there are two type of twitter card: summary_large_image and summary

<meta name="twitter:card" content="summary_large_image" />
if you need change to large image, you need add below code to twitter.php manually, not in the admin panel:


function twitter_card_type( $card_type, $query_type, $object_id )
{
 return 'summary_large_image';
}
add_filter('twitter_card_type', 'twitter_card_type', 10, 3);



more information from: https://github.com/twitter/wordpress/wiki/Cards 

I am going to vote 1 star, not good plugin, really wast time.

not good plugin from twitter

Official Twitter and Periscope plugin for WordPress. Embed content and grow your audience. Requires PHP 5.6 or greater.

WPTagSanitizer vs Twitter