I've seen business come my way with giveaways--just be sure to choose popular blogs/FB users that fit your target market. The giveaways themselves are pretty easy. I do a giveaway once a month to my fans, just because I like them, but I also join others' giveaways, too. I tend to giveaway items like my green eggs and ham set--it's very popular, gets people looking at my other items, and yet isn't often people's first choice when shopping in my shop. They tend to buy my breakfast foods for example, then in another buy they'll buy the green eggs & ham set.