As a rule, these sites sort thumbs by category and type of content available on a linked gallery.
Sites containing thumbs that lead to galleries with video content are called MGP (Movie Gallery Post).
Some free websites primarily serve as portals by keeping up-to-date indexes of these smaller sampler sites.
These intents to create directories about adult content and websites were followed by the creation of adult wikis where the user can contribute their knowledge and recommend quality resources and links.
There was a rapid growth in the number of posts in the early 1990s but image quality was restricted by the size of files that could be posted.
The method was also used to disseminate pornographic images, which were usually scanned from adult magazines.
The invention of the World Wide Web spurred both commercial and non-commercial distribution of pornography.
The rise of pornography websites offering photos, video clips and streaming media including live webcam access allowed greater access to pornography.
Pornographic images had been transmitted over the Internet as ASCII porn but to send images over network needed computers with graphics capability and also higher network bandwidth.This type of distribution was generally free (apart from fees for Internet access), and provided a great deal of anonymity.The anonymity made it safe and easy to ignore copyright restrictions, as well as protecting the identity of uploaders and downloaders.A 1995 article written in The Georgetown Law Journal titled "Marketing Pornography on the Information Superhighway: A Survey of 917,410 Images, Description, Short Stories and Animations Downloaded 8.5 Million Times by Consumers in Over 2000 Cities in Forty Countries, Provinces and Territories" by Martin Rimm, a Carnegie Mellon University graduate student, claimed that (as of 1994) 83.5% of the images on Usenet newsgroups where images were stored were pornographic in nature.Before publication, Philip Elmer-De Witt used the research in a Time Magazine article, "On a Screen Near You: Cyberporn." Godwin recounts the episode in "Fighting a Cyberporn Panic" in his book Cyber Rights: Defending Free Speech in the Digital Age.A linklist is a (frequently) categorised web list of links to so called "freesites*", but unlike TGPs, links are provided in a form of text, not thumbs.