A postcard sends an expression of how much you value that relationship. The postcard itself represents time spent by you finding a postcard, writing in it and

A postcard sends an expression of how much you value that relationship. The postcard itself represents time spent by you finding a postcard, writing in it and sending it off during your vacation. A picture posted to social media has none of this meta-cost and is "cheap". I think in the early days of texting and social media, the act of using these tools was also high cost. Sending a message costs money, signing up for a social media account, bringing along your cell phone and uploading a picture wasn't always easy or cheap. Decades ago, I think a long distance phone call was treated similarly for the same reasons. International calls even more so.