Working with a number of other blogs one thing that strikes me that has to be of enormous worth by committing to the OU platform is the lack of spam.
This may be a basic set up, but it is good at the thing that matters most - permitting the generation of and sharing of content.
Without adverts popping up, spam (deviously written to look like a genuine comment you will find) and the impression that the provider really does want you to upgrade.
What matters in a learning environment are the comments of one or two, perhaps regular readers ... whose blogs you read too.
(whether ot not you care to say 'hi' or comment)
You do not need a presence on a commercial website with a readership of millions to share your OU learning experience. In any case, you'll be lost like a needle in a stack of needles.
Content should be King.