Interesting to see that Google is moving into StumbleUpon’s serendipitous discovery territory with the addition of a recommendations button to its toolbar.

In a twist from StumbleUpon’s social discovery approach (people like you, like this), Google’s dice icon will take you to its recommendations based on your own search history.

Another step in Google’s personalisation of the web, following the likes of custom search and the personalised start page.

As a fan of StumbleUpon I hope that their critical mass in terms of community and more social method of discovery will help them survive the competition from Google and many others.

How long though until Google incorporates social search into the service – after all aren’t inbound links just that?