Rafflecopter is the world's easiest way to run a giveaway online.

Rafflecopter allows you to customize and embed an entry form on your site that incentivizes your audience to perform tasks in exchange for entries into a sweepstak...
See More es. Customize your widget and place it anywhere HTML is accepted, whether it’s on your Wordpress blog, your Facebook page, or both. Provide the promotion details, plug in the prize, and you’re off and collecting entries.

The more entries completed by entrants, the better chance they have of winning, and the more interaction your promotion receives, helping you grow your community.

And *psst*, Rafflecopter is free to use! :)

Build your email lists. Grow your audience across all your social networks, including Facebook, Twitter, and Pinterest. When your promotion ends, Rafflecopter gives you the tools that makes selecting and announcing a winner a piece of cake. Download all your entries (including name, email, IP, timestamp, entry options, etc) into an excel spreadsheet with a single click.