Comics-scifi_collectibles Is a Volunteer Community Mentor.
@elware It is NOT a good idea to post items that are for sale on eBay on other sites. If the item sells on the other site and eBay then you have to cancel one of the orders. If you cancel an item that sold on eBay you have to cancel as out of stock and receive a DEFECT on your account. Not too many defects and you are banned from selling on eBay.
You CAN use Social Media to help advertise your eBay listings. See this page>
https://export.ebay.com/en/marketing/promote-listings/connect-with-more-buyers-using-social-media/
