Sandesh

Lightweight Live Ajax Search plugin enables AJAX powered live search. Lightweight and provides a shortcode to display live search input box anywhere. You can place a shortcode wherever you want. Fully optimized and easy to use plugin.
<h3>How to use?</h3>
** Replace theme’s search form **
If you want to replace them’s search form, then it is a plug and play feature.
<ol>
<li>Go to Setings->Live Search</li>
<li>Enable Replace Theme’s Search Form option</li>
<li>Select the post types you want to allow for a search</li>
<li>Save it.</li>
</ol>
All instance of your theme’s search will replace with Live Ajax Search
** Use shortcode ** 
In some cases, if you do not want to replace theme’s search form, copy the shortcode and paste it anywhere you want. You have full flexibility on it.
<ol>
<li>Go to Setings->Live Search</li>
<li>Disable Replace Theme’s Search Form option</li>
<li>Select the post types you want to allow for a search</li>
<li>Save and Then Copy the shortcode and place it anywhere you want.</li>
</ol>

Lightweight Live Ajax Search

Live Ajax based search functionality. Lightweight and provides a shortcode to display live search input box anywhere.

Miguel Escalera

Auto-Social Meta Tags ASMT83 Adds social meta tags automatically on posts, pages and other parts of a WordPress site by using existing characteristics, like the excerpt, tags and featured image.
<h3>How does it work?</h3>
This plugin adds meta tags to the head of pages and posts. 
If the page or post has a featured image, it adds the following tags. If there is not, the tags are not added. 
– LINK image_src 
– META twitter:image 
– META og:image
If the page or post has an excerpt, it adds the following tags. If there is not, it will take the blog’s tagline/about. 
– META description 
– META og:description
Using the page’s or post’s title adds: 
– META og:title
Using the post’s tags adds the following. If there are none, the tag is not added. Pages do not have tags. 
– META keywords
To add the type tags it needs a custom option in the post or page that you have to set. If the option is absent, it adds the value ‘article’. 
– META og:type 
– META twitter:card
Using the post or page’s permalink (URL) adds: 
– META og:url
Using the Facebook App Id introduced here, it adds: 
– META fb:app_id
That’s it. It is a short plugin for meta tags, but it does the work.

Auto-Social Meta Tags ASMT83

Adds social meta tags automatically on posts, pages and other parts of a WordPress site by using existing characteristics, like the excerpt, tags and  …

Lightweight Live Ajax Search vs Auto-Social Meta Tags ASMT83