If you have a Google account and you've logged into it today then you may have noticed a change to the search results page interface. If you haven't had a chance to check it out yet check out the short video below...
Google have decided, after a few months of testing, to make the search results page, for logged in users, a little interactive. Following on from social media, you now have control over the results when you run a search. You can prioritise the results yourself rather than have Google do it for you so that you decide what the most important result is and more that to the top of the page. The result is that the next time you run the same search, again only when logged in, you get the results you've 'created'.
So what can you do on this new interface?
If a result that you expected is not displayed on the search engine results page (serps) then you can manually add it by adding the url of the web site and then giving it relevance on the page.
For each result you can now add comments that you can either keep private or make public and apparantly each public comment can be voted for; I have yet to try this out for myself though.
All in all, it's about giving the searcher greater control over results that they, and not search engine optimizers or even Google, deem more relevant.
A good move by Google I think.
Check out lead Google engineer Amay explain SearchWiki in this short (2min) video below...