It covers instant messengers too. You need to obtain the consent of the person receiving the message, before prefilling the message with the URL and text for their FRIEND to send them. Sorry buddy. That road is closed for you too!
Social media MAY be an exception, but that's because people are already used to receiving a ton of spam on it, so your "viral post" will be ineffective to begin with, and probably filtered by Facebook and not shown to most people at all. Enjoy.
All the original social platforms such as Facebook and Twitter used ways to invite others by email (famously in Harvard etc.) So now they are burning the bridges behind them and no one can do it anymore.
Referring friends and family by sending emails on your own? Who the fuck does that since ~2010? Ever heard of social media and instant messengers?
Edit: Parent was a wall of text when I responded. Stealth editing it to something completely different is not cool.