Facebook is planning to roll out a new version of its Groupon-style Deals feature over the next few weeks, starting with a number of cities such as Atlanta, Dallas and San Diego, according to the company’s director of local. Not surprisingly, the new version of these digital coupons plays on the social nature of Facebook and its ability to influence a user’s social graph. While the social network may be late to this particular party, doing that is going to focus attention on one big hole in the Groupon model: namely, the fact that it isn’t really social.

Emily White, a former Google ad exec in charge of the effort, describes in an interview with Internet Retailer how the site will highlight in a user’s news feed if they have indicated interest in a particular deal, and also if they have actually purchased one. Presumably, users will also be able to opt out of this feature, given Facebook’s experiences in the past with ventures such as Beacon — which publicized purchases users made at other websites and was eventually shut down after a firestorm of criticism from privacy advocates. According to White:

The fact that every step of the process — from interacting with the deal, booking the deal and experiencing the deal — is tied to friends makes it more likely that you’ll have a positive experience.

Obviously, a lot of that is Facebook’s spin on why its new service is going to be competitive with Groupon, which has become the 800-pound gorilla of email marketing by expanding rapidly over the past two years into more than 500 markets. The company’s revenues are estimated to be in the $2-billion range on an annualized basis, and it’s said to be planning a public share offering that could value the company at more than $25 billion. What Facebook is to social networking, Groupon has become to email discounting.

That clearly poses some challenges for Facebook, as my colleague Ryan noted recently. But Facebook’s view of its strengths compared to Groupon isn’t just spin. It reinforces that deals from Groupon — and even from competitors such as LivingSocial, which is also valued in the billions of dollars on the private market — aren’t that social. I wrote about one of the drivers behind Google’s reported $6-billion offer for Groupon being the fact that advertising is becoming social, and that is true. And when it comes to being social, Facebook is light years ahead of Groupon or LivingSocial.