You can email your campaign and post it on your website or social media. 

An email campaign can be Archived and a link to the Archive webpage or archived campaign can be posted.

To archive the campaign, navigate to Workspace > Email Marketing > Campaigns. Scroll to the right in the grid and locate the Archived column. Check the box for the campaign template.

Then from Actions, either provide the Archive Link or View Archive and copy the link to the single campaign.