Check out Groupon Stores. Groupon just released a self-serve store for deals where you can get customers to follow your business and push out deals to them. They're not exactly the same, but Groupon's new offering is a very different beast than the daily deals it was offering before and much closer to Facebook Deals. Those two combined with the LBS's going to make it very interesting for businesses. Marketing is changing at an increasingly rapid pace and while there are themes, I don't think anyone can guess where it will be in a year or two.
I don't think it's really like groupon. The core of groupon isn't a deal, it's a surge of attention pushed out to a large group of subscribers.
Your point about assimilation deserves some discussion though. I don't think facebook wants to buy any location based companies, it's in a good position now to just be the underlying platform. They don't have a whole lot to gain by buying these companies anymore.
But deals and offers is mostly a sales and support problem, and that's the kind of thing facebook /might/ build through an acquisition.
On a related note (full disclosure), I worked with Signpost when they were Postabon, and I got the question "You mean like Groupon?" 100% of the time until I started differentiating the two in my initial explanation.
