I’ve just started the Facebook and Twitter accounts for Bang Studio. Rather than use my personal twitter account, it is smarter SEO to start a new account and then follow it with your other accounts. It is a basic piece of astro turfing, but not particularly naughty. The Facebook is a page created from my own personal account. On both I have added likes / follows.
Part of the secret is a little but often adding content and looking for good social matches; and over time interaction can develop.