A spoon and a fork are competitors in cases where you're eating corn or rice, but you don't use a fork to sip soup or a spoon to eat salad. Sure, there will be

A spoon and a fork are competitors in cases where you're eating corn or rice, but you don't use a fork to sip soup or a spoon to eat salad. Sure, there will be instances in which Twitter and Posterous compete, but I think those might be less frequent corn or rice scenarios. I'm trying to show him that there are two distinct purposes both services serve. Maybe a Twitterous spork is begging to be made. :p