In fact, whereas only three percent of users to such sites chose to sign in using their LinkedIn identities in a Gigya study last July, that number had increased all the way up to 20 percent by January, the company reported this week in a on the topic.

Gigya helps integrate online businesses with social networks such as Facebook, Twitter and LinkedIn, including providing the technology that enables what it calls "social sign-on," or the ability to sign in using an existing identity from a social network. Gigya technology is used by more than 280 million users each month across more than 500,000 sites, it says.

While it's still more common to see sites that allow visitors to sign in using their existing Facebook and identities, LinkedIn began providing similar functionality about a year ago. Now, it looks like users of business-oriented Websites are taking full advantage of that capability.

In January, LinkedIn accounted for 27 percent of the social sign-ons at stock market news site SeekingAlpha, Gigya notes, while the Harvard Business Review saw 20 percent of its social sign-ons come through LinkedIn. The Internet Advertising Bureau, meanwhile, saw 14 percent come in that way, Gigya reported.

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