Google has made Friend Connect available to all webmasters in a beta form. Friend Connect lets sites add social networking to their site. But users can sign in with an established account from Google, Yahoo, AOL, or OpenID, instead of creating yet another account.
Here's a vid with more details
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.