LinkedIn continues to move forward in their business networking niche of the social world.

They have announced a new service that will be rolled out to select account holders initially that can be used on both LinkedIn.com and a new iPhone app. Here is the Slideshare presentation that appeared in the LinkedIn blog.

And in the wonderfully ambiguous world of announcing a product that is kinda, sorta available LinkedIn puts it this way.

Contacts is available both on LinkedIn.com as well as a brand new app for iPhone. Over the coming weeks, we’ll start sending invitations to try LinkedIn Contacts to a limited number of members in the United States.

Facebook has announced a new look for the mobile presentation of its Facebook Pages for business.

Their Facebook Studio site outlines the new features

For people

A cleaner, simpler look, with better Page layouts for mobile viewing

More relevant information up front so people can see the information they care about most – such as location and photos – at a glance

Streamlined and prominent ways to interact with Pages, including actions such as Like, Call, Message, and Share, all of which now appear at the top of Pages

For Page owners

Higher-appearing pinned posts, where admins can pin important posts (including offers or videos) from their desktops; these posts are now front and center when Pages are accessed on mobile devices

Social sign-ins are the perfect way for sign in providers to take advantage of the typical lazy Internet user. Rather than having to remember pesky logins and passwords for many sites, users can sign in using any number of social login options. The major players are the usual suspects of Facebook, Google+, Twitter, Yahoo! and more.

As a quick refresher, here is a definition of a social sign in from eMarketer and the warning label that is implied with all of them.

Social login allows users to sign in to sites using their social network ID and avoid creating yet another username and password. Marketers can then gather customer insights on the user from their social profile, as well as potentially post the user’s site activity to a network. Of course, marketers must be extremely careful about how they frame and implement social login, as privacy concerns are a leading reason users shy away from the service.

The real concern for those who are aware of just what information they are offering their favorite social network via this activity is privacy. Since the majority of Internet users are either A) unaware of the privacy issues related to social logins or B) couldn’t care less about the privacy issues associated. The likelihood being that most fall in the latter category.

But let’s get to the numbers! Who’s winning this race?