You can submit your Web Science 2012 contribution via EasyChair using [this] link.
You can also copy/paste the following URL in the address bar of your browser: https://www.easychair.org/account/signin.cgi?conf=websci12
Use the Word or LaTeX templates for WebSci12 for you final submission. Templates can be downloaded [here]
Posters can be formatted in any size up to A0 (841 × 1189 mm / 33.11″ x 46.81″), preferably no smaller than A1.