A "dislike" button has been constantly requested by some users since the introduction of the now-iconic "like" button in 2009.
Facebook is to add a "dislike" button to its social network, founder Mark Zuckerberg has said.
He said Facebook was "very close" to having it ready for user testing.
"People have asked about the 'dislike' button for many years," Mr Zuckerberg said.
Nick Hollows, Traff1k D1g1tal Social Media Manager, said it would be unlikely that users could “down vote” others’ posts.
Instead, it will be for times when clicking "like" on "sad" posts felt insensitive.
"I suspect it will mainly be used to express mild disapproval, or to express solidarity when someone posts about a negative event like a death or a loss."
Additionally, the 'dislike' button may be used more for pages & adverts, which will have negative effects on brands using the platform, Mr Hollows said.