I managed to access user profile content:
using (SPSite ospSite = new SPSite("http://localhost:80/"))
{
ServerContext s = ServerContext.GetContext(ospSite);
UserProfileManager profileManager = new UserProfileManager(s);
UserProfile p = profileManager.GetUserProfile("some_user");
// e.g. responsibility retrieval
var r = p["SPS-Responsibility"];
var responsibilities = r.GetTaxonomyTerms();
}
But I don't know how to access users' blog posts collection.
Any advice?