That doesn't mean you shouldn't work with social media. Why? Because regardless of whether it's much of a ranking factor for google now, it's very much possible for it to be a big ranking factor in the future.
By working on your social media, you're pretty much hedging your bets, protecting you and your websites from a future update that could give increased weighting to social links. There are no negatives I can see of working on social signals, you get instant traffic, and it helps diversify your portfolio in case google does update in favour of the twits and the facs.