Just last week I wrote about the new Facebook Feature Posts that are being anchored atop the newsfeed (and are very lightly marked as ads). Well here is another example of the anchored ad unit but using a new format: Offers. The example is from Macy's and includes an in-line offer.
Visually it is very clearly separated, includes a big visual and a unique border (you really cannot miss this).
The ad appears both in anchor format (top screenshot) and in the actual feed. Obviously, the anchoring / promotion causes more visibility and thus virality - the examples here move from "5 friends" of 7,200 Facebook users claiming an offer to 22 friends of 26,000 users within a matter of hours.