LinkedIn co-founder quits, joins Jaxtr

Check your inboxes – there might be an address and job description change on Konstantin Guericke’s profile page. The co-founder of LinkedIn (and VP of marketing) has left the professional social network to take the helm at Jaxtr, a Palo Alto-based start-up, that has developed a widget that allows you to make and receive phone calls, and can be embedded in your MySpace home page or on your blog. The startup launched its service in private beta today.

The service provides local phone numbers that allow callers to eliminate expensive international long distance charges from any of 29 national markets in Europe, the Americas and Asia. Initial countries range from United States to most of Western Europe to Brazil, Chile and Mexico and Japan and Singapore.

We will get to Jaxtr later, but Guericke’s exit shows that LinkedIn might have reached a point of maturity, where the early start-up adrenaline rush is replaced by more sedate practicality. LinkedIn has told us it is profitable and will hit $100 million in revenues by 2008. LinkedIn made its debut in 2002, raised nearly $15 million in VC funding from Sequoia Capital and Greylock, and since then has grown to eight million members. See this recent profile in Business 2.0.

Jaxtr review, to follow, after a few cups of coffee! Photo courtesy of LinkedIn