PSL in an acronym used widely in the incelosphere for 3 consecutive forums that overlapped in userbase and prominent forum members: Puahate.com, Sluthate.com, and Lookism.net. All three forums were well known for their trolling atmosphere and lookist philosphy. This was because of total free speech and long debates about many theories, which resulted in going full circle and eventually moved on to new things, unlike circle-jerk neo-reddit called incels.something. None of these forums had/have sub-forums which self-identified as incel subforums, although the term was widely used in the "Shitty Advice" section of PUAhate, which was the most visited sub-forum the last few years of the site. Every theory and term of the sub-forum was stolen by redditors who, after incels.me creation, kept its reddit ways like censorship, childish terms like "edgy", fear of different opinion and so on. Although the forums had origins in exclusive pick-up-artistry criticism, after the Elliot Rodger shooting, it morphed into a place to almost exclusively talk about how to improve ones looks to get dates on online dating. Lookism.net broke tradition a bit by self-identifying as an incel forum sorta around 2017, as well as becoming more sympathetic to pick-up-artistry.
A PSL rating is the number assigned to you on the decile scale from members of these forums when asking people from these forums to rate you.
Users migrated to lookism.net after server issues. Sluthate was rebranded to redpilltalk.com
PuaHate was a website that was initially intended to be an anti-pickup artist site and was created by a bitter pick-up-artist student of Real Social Dynamics named 'Nicholaus' in 2009. It originally contained a splash screen saying the forum was NSFW and all people under 21 should not enter. The site's users eventually started espousing LMS, looks theory, nutrition and the red pill. Ideas developed on PuaHate include philtrum length theory, compact midface theory and its focus on fWHR. Although, through the entire boards history, the vast majority of threads were devoted to pick-up-artist criticism and not inceldom or lookism. Nor were there any subforums devoted to inceldom or lookism. One particualr famous user of PUAhate was Jsanza29
- Midface theory gains popularity over at PuaHate around Fall
- mkg wants to get fucked by her tall, big-framed coworker.
- mkg plans to get fucked by ivoryace.
- 3/28 - hlimw18 from bodybuilding.com forums went on PuaHate under alpha18. to prove himself after some people questioned his slayer status. This resulted in a flame war.
- 5/23 - Elliot Rodger kills six people in Isla Vista and then commits suicide.
- 5/24 - PuaHate closes in response to the Isla Vista killings.
Sluthate was created on May 26th 2014 and users migrated to it from PUAhate.com. Unlike, PUAhate it had a whole sub-forum devoted to 'Rate me Threads', further solidifying the evolution of the anti-pickup-artist scene into a lookist scene. Eurasian Tiger was a well known user of this site and lookism, and had lots of alt accounts to spread his attitude/worldview. The rumor is that he is not the same user named tyger on PUAhate who bullied Elliot Rodger sending him pics of AMWF couples.
- 5/31 - SlutHate was featured in Cosmo.
- 6/14 - moremoneythanlooks created the facial aesthetics thread. Ideas were copied from the reddit facial aesthetics AMA promoting midface theory and masculinity theory. (The author of the AMA later admitted that he lied about studying midface theory in university and from plastic surgeons.)
- 6/16 - Orthodontist Mike Mew shows up at SlutHate and posted a video response.
- 7/10 - manic786 gets doxxed by Zeusus
- 7/12 & 7/14 - moremoneythanlooks creates the looks maxing and facial aeshetics thread, again promoting midface theory.
- 7/24 - User moremoneythanlooks officially leaves.
- 8/4 - Poster who claims to be the male model Eliran Biton posts his (real or fake) experiences with women on SlutHate.
- 8/12 - mkg took Metatron's virginity and dumps him a week later.
- 8/17 - Ambition/Nordic loses virginity in university.
- 8/25 - djfranktank and Pleosthene goes to university.
- 9/11 - pikachu / IcedEarth leaves SlutHate.
- 9/12 - howdidiwinduphere broke up with his girlfriend.
- 10/2 - Yul Brynner is getting a LeFort 1.
- October - A person called JesslynNicole, who claims to be female, posted on SlutHate. This resulted in many men white knighting her.
- 10/15 - Spartacus got pumped and dumped by his date because she wanted to fuck more attractive men.
- 10/15 - Greg had a butchered nose job.
- 10/17 - JebusN0rmalfa6 broke up with his girlfriend of 5 years.
- 10/21 - Sensdep got laid by using camera angles, lighting effects and morphs.
- animus_liber returns and some question his success with women, causing a flame war
- 11/3 - AIDS invites Sluthate members to an orgy. Only Tyger shows up. 
- 11/14 - Spartacus cold approached a girl and made out with her the same day. He didn't want to have sex because he wanted to make an impression that he's "boyfriend potential". Unfortunately, she never met him again. Also, Spartacus' was angry that his female friend just broke up with her boyfriend and went out to have sex with a guy better looking than Spartacus himself.
- 12/10 - Paradigm Shift (a looks theorist) advertises his ebook.
- 1/2 - lanklet (aged 20) posts that he is no longer a virgin. 
- 1/3 - Emil King (aged 17) loses his virginity to a classmate.
- February 2015 - animus_liber is doxxed. His criminal charges are made public and his is one of the most hated members of the forum. This contributed to several more heated arguments between animus and the site.
- March 2015 - Incelcon 2015.
- March 2015 - Kiwi Farms made a SlutHate.com thread and this resulted in a controversy.
- 3/31 - alienfranco quit his job and becomes NEET.
- 5/9 - The Greensboro Jock was identified. It was discovered that he wasn't as good looking as we had thought.
- 5/25 - cats alleges that YogaPants is the alt of alienfranco. His evidence is that the locations of their IP's match. As a result, there has been a heated argument between alienfranco and this site.
About a year after Sluthate was created, users were complaining about it's name, server issues, very slow loading times, the forum not banning pedo talk, and no limit on signature size. According to eggman, male models he talked to online said they browsed lookism.net as they were curious how they were talked about and how they stacked up relative to other male models. Video where eggy talks about this: .
Around June 2015 a sluthate user created lookism.net after sluthate suffered down time for a few days. The admin's name on lookism.net was/is 'Victory'. Many users migrated to lookism.net's better server. Sluthate was renamed redpilltalk.com in December of 2015 to fix the name issue, despite the forum preferring the name 'incel rage'. By this point lookism.net was becoming relatively big.
Lookism.net is mostly known as a trolling board, one famous troll being a 'virgin' below named 'Orb' (below), who was from bodybuilding.com's misc board liked to fuck with the forum.