@timethief
Thanks for good links and reassurement that intelligent blogging means much more than all the know-how panic that leads laymen to inertia :)
Obviously, wordpress.org gives more if I want more customisation and 'meta things' - yet, I choose not to pay for the hosting (0fees.net and the like have their serious limitations that are not worth the trouble, I guess)
So, I'm left with wordpress.com. As I understand you well, I should construct my posts, pages and title content in such a way as to use the right words. you probably also mean backlinks, anchor text, referring to basic SEO. And I should abandon all my hopes for 'meta' inclusion? Even <h1>< h2>.. tags, or picture names and alt texts, and urls....
And I'll forget about ppc, ppt, aged domains, SMO, but consider video blogging, article marketing, guest blogging, social networking and social bookmarking plus video blogging on YouTube.
By the way, AddThis is visible only at the side of the blog - does it share separate posts in this situation, like available Share button? Still, AddThis Analytics is not installable on wordpress.com...