I am trying to add CUSTOM share buttons to my website for Twitter and Facebook. Is using sharer.php for Facebook appropriate still? How would I pass the Open Graph data? As for Twitter, how would I pass the Twitter Card data? I typically use Addthis.com plugin but it is not appropriate for this project.
I was able to accomplish implementing sharing functionality by using the following:
Facebook https://developers.facebook.com/docs/sharing/reference/share-dialog
Twitter https://dev.twitter.com/web/tweet-button
The facebook share dialog automatically pulled the Open Graph data from the page.