jzellman, eweaver, and I sat around one night last summer and made a grid of these things, for others like twitter, newsgroups, etc. Looking at it, it had hole

jzellman, eweaver, and I sat around one night last summer and made a grid of these things, for others like twitter, newsgroups, etc. Looking at it, it had holes in it, and we half-joked that all someone needed to do was pick some unfulfilled combination of communication axis, and they'd have another startup.