Do not despair.
Whatever platform you choose, you’ll need to make sure it has an RSS feed of just the stuff you want to syndicate into the Open Learning site. It should also be a platform where people can leave comments on your writing, because this experience is about conversations, not broadcasts.
Once you’ve chosen your Open Learning homestead, make a post or two to knock off the cobwebs (and get the RSS feed rolling). Cat photos are optionals.