Tyler Johnson

This plugin searches your posts for YouTube embeds and then wraps the player with share buttons that appear on hover when view on desktop or display on place when view on mobile devices. There’s both a share button for Facebook and for Twitter that share your current post URL. When the post share on Facebook, it share the full URL. When sharing on Twitter however, it uses the shortlink, so that the tweet does not surpass the 180 character limit. It works with both regular YouTube iFrame embeds and the oEmbed system.
View the demo here: http://wpdevelopers.com/wpdeveloper-youtube-share-buttons/

WPDevelopers YouTube Share Buttons

Plugin that automatically creates share buttons over YouTube embeds that appear on hover when viewed on desktop or display on play on mobile devices.

marubon

SNS Count Cache is a plugin which helps you to shorten page loading time displaying share and follower counts through the use of cache mechanism.
Notice: 
In the upgrade from Ver. 0.11.1 or below, Reregistration of information such as client ID, client secret, and access token is needed in the setting page.
The plugin gets share counts for the following SNS and caches these counts in the background.
<ul>
<li>Twitter</li>
<li>Facebook</li>
<li>Pocket</li>
<li>Pinterest</li>
<li>Linkedin</li>
<li>Hatena Bookmark</li>
</ul>
Note: You can select alternative Twitter API for share count retrieval from the following alternatives.
<ul>
<li>widgetoon.js & count.jsoon</li>
<li>OpenShareCount</li>
<li>TwitCount</li>
</ul>
The plugin also caches follower counts for the following SNS in the same way.
<ul>
<li>Twitter</li>
<li>Facebook</li>
<li>Feedly</li>
<li>Instagram</li>
<li>OneSignal</li>
<li>Push7</li>
</ul>
The share and follower counts can be retrieved quickly not through network but through the cache using given functions.
The following shows functions to get share count from the cache:
<ul>
<li>scc_get_share_twitter()</li>
<li>scc_get_share_facebook()</li>
<li>scc_get_share_pocket()</li>
<li>scc_get_share_pinterest()</li>
<li>scc_get_share_linkedin()</li>
<li>scc_get_share_hatebu()</li>
<li>scc_get_share_total()</li>
</ul>
The following shows functions to get follower count from the cache:
<ul>
<li>scc_get_follow_feedly()</li>
<li>scc_get_follow_twitter()</li>
<li>scc_get_follow_facebook()</li>
<li>scc_get_follow_instagram()</li>
<li>scc_get_follow_onesignal()</li>
<li>scc_get_follow_push7()</li>
</ul>
The following describes meta keys to get share count from custom field.
<ul>
<li>scc_share_count_twitter</li>
<li>scc_share_count_facebook</li>
<li>scc_share_count_pocket</li>
<li>scc_share_count_pinterest</li>
<li>scc_share_count_linkedin</li>
<li>scc_share_count_hatebu</li>
<li>scc_share_count_total</li>
</ul>
The following describes meta keys to get delta of share count from custom field.
<ul>
<li>scc_share_delta_twitter</li>
<li>scc_share_delta_facebook</li>
<li>scc_share_delta_pocket</li>
<li>scc_share_delta_pinterest</li>
<li>scc_share_delta_linkedin</li>
<li>scc_share_delta_hatebu</li>
<li>scc_share_delta_total</li>
</ul>
<h3>Arbitrary section</h3>

SNS Count Cache

This plugin gets and caches SNS counts in the background, and help you to shorten page loading time through the use of cache mechanism.

WPDevelopers YouTube Share Buttons vs SNS Count Cache