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The comparison in the title may be a little weak, but it's the closest you can get to describing newly-launched link sharing service Siphs in a few words. Siphs aims to solve the "problem" of emailing cool links to your friends, but being unable to find them again (I'd argue that with searchable mail and social bookmarking, it's not such an issue, but I digress).
Siphs provides a bookmarklet that you hit when you see something interesting online. You then enter a list of email addresses in the box and the link and description will be sent to those friends. All the links you've sent are aggregated in your Siphs account, and a list of the most emailed articles appears on the frontpage, providing a kind of popularity rank.