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.

tomwhale

Embeds a Youtube video onto your blog with the API. Then, when the video is paused or finishes, a popup asks for the user to like the site’s page on Facebook.

YTShare

Embeds a Youtube video onto your blog with the API. Then, when the video is paused or finishes, a popup asks for the user to like the site's page …

WPDevelopers YouTube Share Buttons vs YTShare