Klout only covers Twitter for unregistered accounts. For registed accounts, it has long allowed users to connect their Facebook account and just started to allow them to connect their LinkedIn account to their Klout profile.
Empire Avenue is broader based. One can link up their accounts on Twitter, Facebook (both personal and fan, if they're a public figure), LinkedIn, Flickr, and YouTube, along with their activity on Empire Avenue itself and the activity of the people who are buying and selling your stock there. In addition, one can register blogs on the site and connect them with their profile. It also has communities. It can be a very entertaining time sink.
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Empire Avenue is broader based. One can link up their accounts on Twitter, Facebook (both personal and fan, if they're a public figure), LinkedIn, Flickr, and YouTube, along with their activity on Empire Avenue itself and the activity of the people who are buying and selling your stock there. In addition, one can register blogs on the site and connect them with their profile. It also has communities. It can be a very entertaining time sink.