Yes of course you can share the postcards you get. In fact, I think it’s great if you do.
The swap is about inspiring each other and if you share what you make or get you’ll inspire even more people. Each creator has the copyright, but as long you’re purpose is not commercial it is okay to share them on instagram (hashtagged #ihannaspostcardswap and #diypostcardswap), in the link up post on my blog, on your own blog or in the Flickr Group!
Please do not share someone else’s email or their postal address (not ever!), in writing or as a photo of the back of the postcard, though. Some people will not feel comfortable having these things floating around online.
All links/resources can be found on the main swap information page.