Is Viadeo a serious alternative to LinkedIn?

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I just joined the professional networking site Viadeo. While it has 35 million members it is strongest in Europe and Asia, which is probably why I didn’t know of the service until recently.

I have added a rudimentary profile to http://viadeo.com/en/profile/hakan.soderbom. I expect it will take me some time to explore all the features, however I have to ask myself – how many social sites can I realistically be active on?

What is your experience with Viadeo? Is it a real competitor to LinkedIn?