Chan-sites are brother-sites, they are cooperating with each other.
They just have to inform each other and ask about some help, the results will end up like this:
It can either be like this:
1. The people, (that most of the time calls themselves “Anonymous”), will give some backup (aka “blackup” at chan-sites).
2. The anons will reply on the so called help-post like this “We are not your personal army”, or “Not Your Personal Army” (NYPA).
The 2nd option is the one that is the most likely to occur, the reason for that is that the Anonymous often are lazy, and don’t want to help people that needs help IRL. But of course, there are anons that has a golden heart and helps others.
If there is anything big happening (mostly in the internet world) like a raid against a single person or against a company, the chan-sites can be somewhat helpful. All chan-sites have many computer skilled people and they have plenty of skilled hackers.
Chan-sites like 4chan, 7chan, 420chan (and so on) have made some raids. The most common hacks/raids from the chan-sites are the DDoS attacks and prank calls (if that counts as a hack, but obviously a raid).
Examples of hacks/raids:
The Hal Turner attack (2006-2007) – Anons from 4chan and other chan-sites prank called and made DDoS attacks to him and his website. The result of this attack was bandwidth bills that cost him thousands of dollars, according to himself.
The Google Hot Trends attack (2008) – The swastika symbol (卐) (often referred to the ”Nazi symbol”) climbed to the top of Google’s Hot trends list (a compilation of the most popular search terms in the U.S.). This symbol lasted on the list for a several hours, before Google removed the result.
Operation: Payback (2010) – This raid is the latest raid made by any chan-site. In retaliation against the Motion Picture Association of America and the Recording Industry Association of America hiring of Aiplex Software to launch cyberattacks against the torrent site The Pirate Bay, anons from the chan-site 4chan initiated their own attack. This was made by DDoS’ing all three companies websites, which made the sites go offline, affecting the companies, but also other anti-piracy companies. Another consequence to this raid, was that a file containing about 300 Mb private company emails leaked out on the net and is downloadable at many torrent websites.