Now, I'm reasonably sure that within each family of communities the membership crossover is pretty big. I count myself reasonably bright (perhaps arrogantly) but I'm still sure that I'm not the only one who realises this. In fact, some of the communities have neat little bios that explain what is for what.
So, where do people get the impression that "X-Posted Everywhere", perhaps with a cheeky smiley, is acceptable behaviour?! It's not big, it's not clever, it makes the poster looks like an inconsiderate fool. Stop cluttering my screen estate.