Facebook started framing external links (at least the ones from posted items) with a small Facebook iframe.
Tags
alerts
best bets
branding
breadcrumbs
design
disclamer
facebook
facets
forms
header
homepage
iframe
landing_page
leftnav
listing_display
menu
messages
messaging
mobile
navigation
options
popup
promo
promos
recommendations
registration
research
save listing
search
search_state
steps
suggestions
tabs
tip
tips
tools
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