EDD Social Discounts - If you add the shortcode to your purchase confirmation page, and only 1 product is purchased, it will share the URL to that product in each of the social networks.

gistfile1.php

<?php

function sumobi_social_discounts_purchase_confirmation_url( $url ) {
	global $edd_options;
	
	// make sure we are on the EDD Purchase Confirmation page, else return
	if ( ! ( isset( $edd_options['success_page'] ) && is_page( $edd_options['success_page'] ) ) )
		return;

	// get the purchase session
	$purchase_session = edd_get_purchase_session();

	// get purchase key
	$purchase_key = $purchase_session['purchase_key'];

	// get payment_id from purchase key
	$payment_id = edd_get_purchase_id_by_key( $purchase_key );

	// get cart using payment ID
	$cart = edd_get_payment_meta_cart_details( $payment_id, true );

	// get first download from cart
	$first_download = array_values( $cart );	
	$first_download = array_shift( $first_download );

	// get the first download's ID
	$first_download_id = $first_download['id'];
	
	// set URL to the site's URL if more than 1 product
	if( count( $cart ) > 1 ) {
		$url = site_url();
	}
	// only 1 product, set the URL to be the URl of product
	else {
		$url = post_permalink( $first_download_id );
	}
	
 	// return URL
	return $url;
}
add_filter( 'edd_social_discounts_share_url', 'sumobi_social_discounts_purchase_confirmation_url' );