php - Facebook's api- wall updates(photo) with hover state -


i'm not sure if best place ask question how pict.com post photo has hover effect on user's facebook feed? i've been researching 2 days now, know facebook can allow third party app post status updates, photos etc user's wall(with consent of course), how make image have hover effect, have no clue. love build if can nudge in right direction.

ref
pict.com
http://blog.pict.com

if image hovering on users actual facebook wall, might browser extension, work facebook api, (which around 1 year ago), impossible due security reasons, code running on users wall,

the image have hover effect on app, once posted on wall hover effect disappear, due being controlled different code,


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