This is something I haven't really cared much about up until I saw massive volume coming from mobile. This is from a campaign that only ran on "left column Desktop browsers". What's up with this? How do I stop FB from sending me all this useless traffic? (it's useless because the campaign is optimized for desktop only)
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Weird, but FB isn't known for it's 99+% accurate targeting. You likely won't be able to stop it, but what you could do is redirect mobile users to a similar page but with an email form with something along the lines of "Unfortunately this game (or whatever) doesn't work particularly well on that thing in your hand. Want to revisit from a computer? Fill in your email here and we'll send you a link to make things easy."
Yep, zeno, already doing that! But it is just outright stupid they show the ads to mobile users.
Unless they target based on m.facebook.com vs facebook.com - I don't use FB via my phone but I assume people might be able to view the desktop FB layout via a smartphone/tablet if they choose to?