First follow your favorite brands or stores on Twitter and Facebook. It might be obvious, but it's effective. Many retailers promote special sales or discount codes on those site.
In addition some stores have separate twitter handles for deals such as @amazondeals, @targetdeals, @ebaydailydeals.
Also, be sure to use social search engines. Take your online search for bargains a step farther with sites like topsy.com or bing.com/social. They let you surf the latest sale-related posts on Facebook, Twitter, and Google+.
Then, share your savings with friends. A lot of online stores like ideeli.com and modcloth.com reward you with discounts or credits if you get others to sign up and make a purchase. When given the choice, send a referral URL to your social networks instead of entering your friends' and family's individual e-mail addresses.
Finally find discounts on Twitter by using popular hashtags. If you combine words such as "shopping" and "clothing" with tags like:
