I would recommend finding a nice private group to get involved with a community but considering I didn't and don't do that myself, it seems disingenuous. In reality, limit your browsing to #destiny and #community (and #bungie on Fridays) for a while. I've found it's much easier to get integrated into the Septagon and the Destiny forum than it is The Flood. They're less harsh and the conversation is more conversational and less argumentative than the latter.
As long as you check in regularly to those two tags, you'll start to be able to learn more about how the community functions and what sort of threads are and aren't worth reading. Once you're there, sifting through the sea of threads is much easier and you can ease your way into #Offtopic (something I didn't do until about six months of regular posting).
After all that, you should be a regular old BNetter. And, if you're lucky, you may pick up on a few inside jokes along the way.
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What do hash tags do? Do they have to do with waffles?