Protesters from the Anonymous India group of hackers wear Guy Fawkes masks in Mumbai, June 9, 2012. (Reuters/VIVEK PRAKASH)

Activist hacking group Anonymous plans to mount an attack on Facebook and gaming service Zynga, according to an online report published Monday.

Anonymous is reportedly planning the attack following layoffs at Zynga, the creator of ChefVille and Zynga Poker, among others.

A posting on Anonymous' website reads: "Zynga customers and Facebook users, we are anonymous. During the last few days anonymous has been targeting Zynga for the outrageous treatment of their employees and their actions against many developers."

Zynga accounts for a significant percentage of Facebook's daily revenue.

A Facebook page has also been set up, encouraging supporters to rally on Nov. 5 in London, England, in support of Guy Fawkes Day - while wearing masks popularized by the movie V for Vendetta.

Guy Fawkes Day commemorates a conspiracy to blow up parliament in England in 1605.

The Facebook post claims that the London march is the centrepiece of a worldwide Anonymous campaign, and protests are also listed on the Facebook page for Toronto and Quebec City.

The posting adds that protesters will march peacefully and are unarmed.