The "I support Christopher Jordan Dorner" page on Facebook had been "liked" by more than 100 people on the social networking site by early Thursday afternoon.
It appeared that many commenters were using pseudonyms to write on the page.
"I don't doubt that the cops shot up and killed their own just to blame him so everyone can be scared and turn him in," wrote a "Sarah Bianez," near Los Angeles.
Conspiracy theories written with broken grammar abounded as law enforcement agencies searched for the 33-year-old La Palma man who is sought in connection with the killing of a couple in Irvine and a police officer in Riverside.
A man writing under the name "Rueben Muniz," whose Facebook page says he lives in San Diego, wrote:
"So many false information...the media is like a circus, I even think they are really trying to confuse even us Conspiracy Theoirist, I know that most of the public is blind to all of this, but how can one person be at 2 place at once?
Unless he hs others helping him, or is this whole thing is a set up, or a practice for martial law??? Hmmm. I'm going to do more research on this..."
Others expressed outrage over the Facebook page existing.
A commenter identified as "Kelly Edwards" had harsh words for those who supposedly support Dorner:
"Is this for real!! Anyone who "supports" this man is an idiot. Weather he was wronged by the LAPD or not does not give any human being the right to take innocent lives.
Are you saying that if you crossed someones path they have every right to exact revenge on you by killing a loved one?? How can you people be so ignorant? You deserve to come in contact with this awful excuse for a human being and have your own pathetic life taken."
Authorities issued a Blue Alert throughout Southern California on Thursday as multiple law enforcement sought Dorner and the hunt spread into the Big Bear area.
The alert system was enacted in January 2011 and was inspired by the Amber Alert notification system that alerts the public to abducted children.
It warns the public of suspects on the lam who are wanted in connection with killing or seriously injuring peace officers.
A Blue Alert gives the public details about the suspect's physical description, as well as a description of the vehicle they are driving and its license plate number.
Dorner is suspected of targeting police officers because he was fired from the Los Angeles Police Department in 2008.
Authorities say Dorner ambushed two Riverside officers early Thursday morning, killing one.
He also is wanted in connection to the killings of Cal State Fullerton assistant basketball coach Monica Quan and her fiance, Keith Lawrence. The killings took place on Sunday in Irvine.
Quan is the daughter of a police captain who represented Dorner in an LAPD departmental hearing that led to his firing.
In addition to the Facebook support page, someone set up a page with Christopher Dorner's name and a photo of the suspect and posted running commentary throughout Thursday.
On post read: "Imagine a world where no one judges you but your work. Imagine being promoted because you're quality and qualified. This isn't the world. Good people are vilified. It is vile."
Dorner's name trended on Twitter throughout the day as news agencies posted updates on the manhunt and those following the story weighed in:
"1st time I heard the media say mental illness when it comes to a black man killing ppl #Dorner" tweeted lord_flaco @B3T_DAT.