This appeared in my news feed last night, and is still there now. It moves like a normal item (i.e., its not 'sitckied' to the top or anything like that).
On mobile its pretty jarring. Bigger than any other posts.
Obviously, it's very popular to share photos and videos on Facebook, and it's understandable that those forms of media will take up a large percentage of small mobile screens. Not really an issue specific to advertisements.
Mobile: http://i.imgur.com/kQlmh.png
Desktop: http://i.imgur.com/ZiOqX.png
This appeared in my news feed last night, and is still there now. It moves like a normal item (i.e., its not 'sitckied' to the top or anything like that).
On mobile its pretty jarring. Bigger than any other posts.