Hello @CarolynN77 ,
You can generally just include links to fundraising pages on social platforms in emails as regular text, image, or button links - similar to linking to other social pages or websites. From there your contacts that open those links can share the URLs with others.
You can also include Share options for some platforms within your own email, as a way for your contacts to share the webpage version of the email (including all of its links and imagery) to their followers and friends.
See also:
Adding text links
Adding image links
Adding button links
... View more