answer:1. Interest. If a blog has high-quality, interesting posts on a topic I care about, I go back. 2. Interest – see above. 3. Interest – see above. 4. Damninteresting; 3QuarksDaily —-> Damninteresting was, basically, really interesting. No politics or any other bullshit; just high-interest stories on a very wide range of topics aimed at the educated layman. It was (is) brilliant material for “general” B1+ ESOL classes. —-> 3 Quarks Daily goes through phases of brilliance, alternating with mundanity/crap that I have no interest in. Its strength lies in having a staff of several (at least) bloggers that basically make it worth my while to access the site at least once a week.