Good point. I think the analogies with Word and Twitter are useful ones. It is just the same in that users express themselves through the tools and they can and should express whatever they want. Where Word and Twitter and Second Life are all different is the business model, how to stay in business. With Word we'd prefer if readers of our documents didn't need to buy a copy of Word. I'd prefer similarly that people could experience the gigs I occasionally play without the overhead of the client download and sign-up process. If Word lacked the ability to embed pictures, we'd probably argue that the tools needed improving. And twitter certainly doesn't decide what gets tweeted but it does make it as easy as possible to participate and be involved. Part of my argument is that in SL for many people being involved may be more consuming that producing, and that the creative users should be given the tools to help direct those more consumer-focussed users to their creations.