Been looking around for these paths all over and figured I would help anyone else who are in need!
You can use any icon (inside an 'a tag') using these service url path's as the href to share your pages content to any of these social media platforms.
Some of these paths have been changed to only use the "[URL]", grabbing the META information from that url. So to customize the post you need to customize the metta information of whatever URL you are posting.
Replace the [TITLE] and [URL] with real information in your browser to test what you get.
Social Media Service URL Examples