I started doing something similar years ago. However, I should go into more detail as others do. For instance, what we ate and where we ate. I store the info in a number of different places, which I constantly go back to for reference. It gets so bad sometimes I have to check these notes to find out if we have been in such and such port before. I first just did periodic emails to the kids back home (to let them know we were okay) and a few friends, in which I described shore excursions and shipboard events of interest.
Once in a while I might attach one or two pictures but back then it took a lot of Internet time and money to download them. I compose when I'm not on line, so when I get ready to post it only takes a few minutes. Some years ago I began using F.B. as they compact pictures, I find the F.B. picture quality to be superior to using emails and I can send a dozen pictures plus my harangue in just minutes.
I read somewhere, one time, that doing this is like inviting guests over for dinner then putting on a slide show of your travels. I disagree, using an Internet format isn't making anybody watch anything. Nevertheless, I have had good friends give me a bad time as their wives would read my stuff then give them h__l for being such skinflints and never treating them to a cruise. LOL. Anyway, about ten years or so ago I decided to quit doing that and just send our kids the stories.
However, before I got around to terminating these, the wife of very close friends of ours talked to my wife. Years before they had retired in northern California from commercial fishing in Alaska. Her husband and I went all the way through the 12th grade together in a school on the coast of Alaska. Not only that, we used to hunt, fish and trap together when we were kids and their children and ours pretty much grew up together. My friend had been dying of cancer. Neither one of them wrote much so I didn't realize they were even following my spiels. She said that he couldn't wait to receive my next "editions".