Only if it gets as big as Google. So far, you cannot even look without giving an email address (with no privacy policy or company details to reassure) so there's a fair way to go before they take over the world.
And their claim is neither new nor unique.
Is it a new search engine, or an email harvester? So far the jury is out. Even wikipedia has a only dead link to show for it!
I tried a semantic search on Google - [why is a beta site using viral marketing already?] - but conversational search just found the same old texts on viral marketing that powerset probably used.
See these threads too:
[webmasterworld.com...]
[webmasterworld.com...]
[webmasterworld.com...]
And there's a few more.
Perhaps they should set up a viral marketing agency ;)