I've noticed this too, though it's never happened to me (probably because I've been around for a while and don't even try it anymore). You can post any link to Daring Fireball, no matter how random or irrelevant—even if it's just recycled news with a sliver of Gruber commentary—and it will probably get karma. But no Android in-depth breakdowns, reviews, or nerdery. That is seemingly not permitted.