Any sharing script from social networks downloading insane amount of iframes, which sooo long loading, and some of them invalid and/or have errors in scripts. I'm not ready to use it on my site.
In most cases you can use just a link.
For twitter: http://twitter.com/intent/tweet?url=page_address
For facebook: http://facebook.com/sharer.php?u=page_address
For VK: http://vk.com/share.php?url=page_address
etc.
They have additional parameters like image and title, which they can take from header.
You should only image styles and states for them.
Code and count of network requests was reduced, no more heavy-weight unneeded images, no more errors from scripts and everything is valid.