I am a believer in the power of online communities. But I'm bugged that most of them are islands. They don't connect to each other. And it's more than inconvenience -- it's getting in the way of business. Here's why: Right now, online content companies share a lot of content, and a lot of business revolves around that. They all have communities, too, but they can't share them, for a variety of reasons. I sat across from Marc Canter at Kevin Werbach's pre-pre-Supernova party the other night and I asked him this question: "How will communities connect?" Mark was the right guy to ask. His post on this topic talks about initiatives (his and others') that are attacking this problem.