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Wikia, the Wikipedia founder's for-profit wiki service, has acquired Grub, a distributed crawler system developed by LookSmart. Grub is distributed in the sense that the crawl (roaming the web and indexing the pages) is done by a network of personal computers around the world, SETI-style.
So Jimmy Wales is essentially trying to create a community effort around his new social search engine (this was originally rumored to be called Wikiasari, but that isn't the case). That may depend on goodwill from users, something that's harder to achieve if Wikia Search is for-profit.