When doing a large blogposting session split the results into failed and posted. then run the same task on all failed url's. Then split the results into posted and failed. then run the same task on the 2nd failed url list. I've been getting about 13% to post successfully 1st rerun and about 4% success on the 2nd rerun. this knocks 20% off the failed list which can be literally hours and hours once they are given to the slow poster. Very simple - very untechnical tip, that took me about 6 months to work out.