I honestly don't understand whats wrong with this. It just seems like the natural progression of the services that Google already provides. If my friend searches for a new phone, they should see my public reviews of the phones. Friends reviews should be made front and center because reviews from people we know are always more valuable. The way the page reads, it seems they will only use your reviews in ads for friends, I think that's fair, but if they use it for strangers too then I'll probably opt out.