Facebook has two methods of sharing. The “Sharer” link is simple but the preferred Facebook way is using the Share Dialog. This method does require an app id but offers more flexibility.
Sharer:
https://www.facebook.com/sharer.php?u={url}
Share Dialog:
https://www.facebook.com/dialog/share?app_id={app_id}&display=page&href={url}&redirect_uri={redirect_url}
https://twitter.com/intent/tweet?url={url}&text={title}&via={via}&hashtags={hashtags}
Google+
https://plus.google.com/share?url={url}
https://pinterest.com/pin/create/bookmarklet/?media={img}&url={url}&is_video={is_video}&description={title}
https://www.linkedin.com/shareArticle?url={url}&title={title}
Buffer
https://buffer.com/add?text={title}&url={url}
Digg
http://digg.com/submit?url={url}&title={title}
Tumblr
https://www.tumblr.com/widgets/share/tool?canonicalUrl={url}&title={title}&caption={desc}
https://reddit.com/submit?url={url}&title={title}
StumbleUpon
http://www.stumbleupon.com/submit?url={url}&title={title}
Delicious
https://delicious.com/save?v=5&provider={provider}&noui&jump=close&url={url}&title={title}










Go to Dashboard->Appearance->Menus. You can see “Custom Links” like the screenshot on the left. On the URL section write “http://www.addthis.com/bookmark.php” and on the “Link Text” section write “SHARE” then click Add the Menu. You will see the menu is added on the right side like my screenshot below.




