You can add a little post-script to the end of your email copy, such as "Not responsible for your company's social media? Feel free to forward this ebook to a friend or colleague using social media marketing." Link the call-to-action to a pre-made email, complete with subject and body text. That way, all someone has to do is enter their associates' email addresses and hit "Send."
Embedding images, animation, and vids in an email are tricky, as these elements often mess up during the transfer from one platform to another. A multitude of email clients, operating systems, and connection speeds make this an area in which to proceed with caution. Videos and animation are undeniably eye-catching and engaging, so it may be worth the risk of a dropoff to include them.