EchoSign, a Web-based provider of electronic signatures and signature automation, has launched a new tool that allows users to e-sign contracts and other documents with Facebook, LinkedIn and Google web identities.

Unlike fax or paper signatures that offer little means to show identity other than the signature itself, the new EchoSign tool automatically ties your social graph to your e-signature to further verify identities in your business transactions. Your social graph is automatically captured by EchoSign and attached to PDF copies of every signed contract, along with your email address, IP address, signature image, and chronological transaction history. A video demo of how EchoSign works can be found here.