Not possible to add text content.
https://facebook.com/sharer/sharer.php?u=URL
https://twitter.com/intent/tweet/?url=URL&text=CONTENT
tumblr
https://pinterest.com/pin/create/button/?url=URL&media=URL&description=TEXT
https://reddit.com/submit/?url=URL&resubmit=true&title=TEXT
whatsapp://send?text=TEXT%20URL