Underlying these practices is an ethos of invitation that can be precarious on the modern web but must continue. We should be able to learn about trust by engaging this way, and not just in the sense that we encounter so many people who are all trustworthy, but in the sense that we have to think about trust in a transactional way. We have to seek out new ways to establish boundaries and trust at the same time in order to understand the true potential of web based collaboration.