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I can't remember where I've seen it, but there was a site or forum focused on user-generated content I used to frequent way back which had the rule that you could not submit new stuff before being registered for a few days and having posted at least n comments. This kind of forced you to be part of the community, browse existing content and get yourself accustomed to the way the site worked before it allowed you to actually contribute. I found that to be a really good idea, to be honest, but I haven't seen anything like this again. And this is also coming from someone who has joined Hubski only a little more than an hour ago. So do it.