Last week, Google enabled an interesting feature: custom backgrounds for its search page.

Google Social Search , launched in late October as an experimental way to combine your social networks with Google’s search results, has mysteriously disappeared today. When trying the service , we’re greeted with the message: “The experiment you’re trying to access is no longer available. Go to experiments overview”.

A reminder: today is the due date for Facebook to switch on Facebook URLs for pages with less than 1000 fans: in other words, almost all Facebook pages will be able to set up facebook.com/yourbrandhere. One restriction has been added, however: you now need to have more than 25 fans. The Facebook help section reads: Your Facebook Page must meet two requirements: it must have been live on Facebook prior to the May 31, 2009 cut-off date and have had a minimum 1,000 fans at that time.