How to detect fake reviews is a real problem in the digital age, and we’ve written before about how to tell fake reviews from real ones, and generally how to spot fake reviews. Now there is a new tool in the fake review spotting arsenal!

What would you do if you posted a review on Yelp and then were sued by the business that you had reviewed, over that Yelp review? That’s exactly the situation that Robert Duchouquette and his wife Michelle found themselves in after posting a negative Yelp review for Dallas pet sitting service Prestigious Pets.

A new category of reviews has been added to Yelp: correctional facilities. Yes, believe it or not, there are reviews for prisons and jails from coast to coast, including Rikers Island (New York) to the Los Angeles County Jail (California) and locations in-between.

Google has gobbled up restaurant review outfit Zagat, in their latest Pacman-like gobbling juggernaut. Since June 1st of this year, Google has acquired no fewer than PostRank, Admeld, SageTV, Punchd, Fridge, PittPatt, Dealmap, Motorola Mobility (if approved), Zave Networks, and, now, Zagat. In fact, Zagat will be Google’s 20th acquisition this year, and they still have three and a half months to go. And Zagat is the 102nd company acquired by Google in the past 8 years, with half of those acquisitions occuring in just the past two years!

Facebook – the site that changes its interface, services, and values almost as often as we change our underwear (hint: daily), has once again announced a major change that affects all Facebook users – and users of other services – in a major way. This week’s announcement is that Facebook is now sharing it’s new “like” system with partners like Microsoft Fuse Docs, Pandora, and Yelp – and any other site that wants to feature the new Facebook social plugins – creating what Facebook calls a “social graph” or “open graph”. This means that when you “like” something on Facebook, that “like” will follow you around to Pandora, Yelp, and Microsoft Fuse Docs – and vice versa. The good news is that you can opt out of it (and we tell you how).