We use our brand name, #socialfresh. This can work for some, but don’t be afraid to pick something unbranded and even language that is more of a casual conversational style. I’ve heard experts recommend not using your brand name in the hashtag. I recommend using your best judgement. It works for us, but your mileage may vary. A great example of an unbranded hashtag is RadioShack’s #UNeedANewPhone hashtag from a few years ago. It was unbranded and very casual (true to the style of Twitter conversations, shortening You to U).