This actually dovetails nicely with an obvious topic, however: roleplaying in the beta for any given game. If you plan to roleplay when the game goes live, beta is a great time to get started, possibly building up character relationships and dynamics before the game has even launched. That's all good stuff.
The problem is that beta is not, in fact, a prequel to the live game. It's a test version of the real game. And even beside the obvious repercussions of rollbacks and the like, there are reasons why roleplaying in beta might not be a great idea.