Use custom social links

social-link-array.php

<?php
/**
 * Get the array of social links.
 *
 * @param  integer $post_id  The post ID of the content to share.
 * @param  string  $network  Optional key to get one single network link instead of the whole array.
 *
 * @return array   $sharelinks  The array of links.
 */
function rkv_get_social_share_links( $post_id = 0, $network = '' ) {

	// Make sure we have a post ID.
	if ( empty( $post_id ) ) {
		return;
	}

	// Get my short link from the post ID.
	$link   = wp_get_shortlink( $post_id );

	// Create the text to include.
	$text	= str_replace( ' ', '&nbsp;', get_the_title( $post_id ) );

	// Build the facebook link.
	$facebook   = 'https://www.facebook.com/sharer/sharer.php?u=' . $link;

	// Build the twitter link.
	$twitter    = 'https://twitter.com/intent/tweet?source=webclient&via=CLIENT-NAME&text=' . esc_attr( trim( $text ) ) . '&url=' . urlencode( $link );

	// Build the pinterest link.
	$pinlink    = 'https://pinterest.com/pin/create/button/?url=' . $link . '&description=' . esc_attr( trim( $text ) ) . '';

	// Make my data array.
	$sharelinks = array(
		'facebook'  => $facebook,
		'twitter'   => $twitter,
		'pinterest' => $pinlink
	);

	// Send it back.
	return ! empty( $network ) && array_key_exists( $network, $sharelinks ) ? $sharelinks[ $network ] : $sharelinks;
}

social-link-build.php

<?php

/**
 * Set the sharing buttons for posts.
 *
 * @param  integer $post_id  The post ID we want to use.
 * @param  boolean $display  Whether to return or echo out the display.
 *
 * @return HTML              The social buttons.
 */
function rkv_social_share_build( $post_id = 0, $display = true ) {

	// Bail without a post ID.
	if ( empty( $post_id ) ) {
		return;
	}

	// Get my link data array.
	$sharelinks = rkv_get_social_share_links( $post_id );

	// Bail if it was empty for some reason.
	if ( empty( $sharelinks ) ) {
		return;
	}

	// Set an empty for the markup return.
	$build  = '';

	// Wrap the links in a div an unordered list class.
	$build .= '<div class="post-share-links">';
	$build .= '<ul>';

	// Twitter link.
	if ( ! empty( $sharelinks['twitter'] ) ) {

		// Wrap the link.
		$build .= '<li class="single-social-link single-social-twitter">';
			$build .= '<a href="' . esc_url( $sharelinks['twitter'] ) . '">Share on Twitter</a>';
		$build .= '</li>';
	}

	// Facebook link.
	if ( ! empty( $sharelinks['facebook'] ) ) {

		// Wrap the link.
		$build .= '<li class="single-social-link single-social-facebook">';
			$build .= '<a href="' . esc_url( $sharelinks['facebook'] ) . '">Share on Facebook</a>';
		$build .= '</li>';
	}

	// Pinterest link.
	if ( ! empty( $sharelinks['pinterest'] ) ) {

		// Wrap the link.
		$build .= '<li class="single-social-link single-social-pinterest">';
			$build .= '<a href="' . esc_url( $sharelinks['pinterest'] ) . '">Share on Pinterest</a>';
		$build .= '</li>';
	}

	// Close the <ul> and the  <div>
	$build .= '</ul>';
	$build .= '</div>';

	// Filter to modify the HTML.
	$build  = apply_filters( 'rkv_social_links_build', $build );

	// Echo it if display was set to true
	if ( ! empty( $display ) ) {
		echo $build;
	}

	// Just return the markup.
	return $build;
}

social-link-display.php

<?php

add_filter( 'the_content', 'rkv_social_share_display' );
/**
 * Filter the content and display the sharing buttons.
 *
 * @param  HTML $content  The original content about to be displayed.
 *
 * @return HTML $content  The modified content about to return.
 */
function rkv_social_share_display( $content ) {

	// Optional filter to disable this all together.
	if ( false === apply_filters( 'rkv_social_links_display', true, get_the_ID() ) ) {
		return $content;
	}

	// Get my social display buttons.
	$links  = rkv_social_share_build( get_the_ID(), false );

	// Return either the links with the content, or just the content.
	return ! empty( $links ) ? $content . $links : $content;
}