Facebook may have to slowly ramp up the frequency of mobile feed ads in order to acclimate its users.
There's no recognition of mobile feed reading, possibly in part because most of the products available on the market are generally anemic and little used.
That's a full two years after Facebook put them in its mobile feed.
It's unclear if Facebook will use the same design in the mobile feed.
However, since Facebook is cautiously ramping up the number of ads in the mobile feed to keep the user experience healthy, mobile ad inventory is far from infinite.
Instagram never had this problem as its square photos always appear full-size in its mobile feed with no need to open them.
Beyond the disappearance of physical gifts, there's a bunch of changes to the product and buying experience that you'll see in the Facebook website birthday's section, on friends' walls, and in the mobile feed.
Facebook could show an out-app purchase ad in its mobile feed that deeplinked you into the app where you could pay a discounted $1 rate to unlock the levels.
We have an example unit at the top of the story, which appeared in the Facebook mobile feed and which Path put money behind earlier this spring.
If Facebook were to completely overhaul the look of the mobile news feed in its main Facebook for iOS and Android apps, that would be a product worthy of years of work and design revisions.
