Heard of Spineworld? I hadn't. But a 10-year-old I know told me he's seeing it everywhere in his circles. Now we know from UK-based market researcher K Zero that its population (registered users) has more than doubled since first quarter '09, from 1 million then to 2.8 million now, according to VirtualWorldsNews. Overall, "the total number of registered accounts in the virtual worlds sector … [Read more...] about More on virtual world growth