An old man sit before a house about to be demolished in Nanchang, east China. [File photo]

"One after another, cases of forced demolition tend to be diluted by the sea of information. Therefore, a new way is needed for people to express their emotion on the issue and possibly contain it," the drafter said.

He and the three other co-drafters of the map did not know each other in the cyber world before, but they gathered for a common idea - "to boycott the blood houses".

He then used the name "Blood House Map" behind the screen, and left a descriptive message for the map: "Let us consumers be united and boycott those blood houses!"

The description asked netizens, who are to add new tags to the map to represent incidents, to mention names of new residential projects rising up on the forcibly seized land.

As for the malicious marking, the mapmaker said he will find a trustable website or publication to carry on mapping and open it for public edit as soon as possible.

The map includes incidents that have shocked the nation, such as the demolition notice with a bullet attached to threaten residents in Hohhot city.

It also displays incidents in which former owners set themselves on fire, such as one case in Chengdu of Sichuan province and another in Yihuang county of Jiangxi province, as their last resort to defend their properties.

One netizen, qhsl, wondered if the map could mark all violent demolition cases, as "some cases that had not been made public may vanish in time".