Many changed their profile pictures to black and white images that simply stated: "In Remembrance of His Majesty, King Bhumibol Adulyadej."
Sites like Google Thailand, news outlets The Bangkok Post and The Nation, also turned black and white.
Others posted images depicting themselves in a position of reverence, in a show of the respect they had towards the late king.
Many social media users that did not change the colour of their profiles found themselves being attacked online and accused of disrespect.
ia