I just have LinkedIn. But I follow a bunch of dev twitters, though I don't have an account personally. I just tab the ones I regularly follow. From what I've seen, twitter is pretty good at spreading the word about your stuff even to strangers. You can tag posts with one of the tags similarly interested folks check for…
Making a facebook/twitter account for your game barely takes any effort at all. You don't "have" to update it every day or even week. And any updates you do make, you'll be making on your sub domain anyway so all you need to do is paste links, which takes a few seconds. Just make a place for a bunch of people to gather…