PluginsPoint

Post Like Button for wordPress Site like Facebook
Live Preview: http://kentothemes.com/demo/kento-like-post/kento-like-post/
Plugin Features
<ul>
<li>Like/Unlike.</li>
<li>Like Count.</li>
<li>Display Thumbnail who like post.</li>
<li>Popup Login Box if user not logged. </li>
<li>Current like Marker for logged in user Like/Unlike.</li>
<li>Unique Like Count, if user Liked will not able to Like again on same post.</li>
</ul>

Kento Like Post

Facebook Style like button for WordPress with like count and user thumbnails.

wponeco

WP1 Like is a simple Like button plugin for posts, pages, custom post types and WooCommerce products.
Demo Links: 
<a href="http://wp1.co/wp/blog/" title="Like button in Action" rel="nofollow ugc">Like button on single post</a> 
<a href="http://wp1.co/wp/lorem-ipsum/" title="Like button in Action" rel="nofollow ugc">Like button on page</a> 
<a href="http://wp1.co/wp/product/cap/" title="Like button in Action" rel="nofollow ugc">Like button on woocommerce product</a>

WP1 Like

Display Like button on posts, pages, custom post types and WooCommerce products.

Kento Like Post vs WP1 Like