Blog

Early example of a "diary" style blog consisting of text and images transmitted wirelessly in real time from a wearable computer with head-up display, February 22, 1995
On December 6, 2002, Josh Marshall's talkingpointsmemo.com blog called attention to U.S. Senator Lott's comments regarding Senator Thurmond. Senator Lott was eventually to resign his Senate leadership position over the matter.
A screenshot from the BlogActive website.
An artist's depiction of the interconnections between blogs and blog authors in the "blogosphere" in 2007.

Discussion or informational website published on the World Wide Web consisting of discrete, often informal diary-style text entries (posts).

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Vlog

A YouTube vlog title card
A Twitch streamer broadcasting live

A video blog or video log, sometimes shortened to vlog, is a form of blog for which the medium is video.

Web 2.0

Web 2.0 (also known as participative (or participatory) web and social web) refers to websites that emphasize user-generated content, ease of use, participatory culture and interoperability (i.e., compatibility with other products, systems, and devices) for end users.

A tag cloud (a typical Web 2.0 phenomenon in itself) presenting Web 2.0 themes
Edit box interface through which anyone could edit a Wikipedia article.
A list of ways that people can volunteer to improve Mass Effect Wiki, an example of content generated by users working collaboratively.

Examples of Web 2.0 features include social networking sites or social media sites (e.g., Facebook), blogs, wikis, folksonomies ("tagging" keywords on websites and links), video sharing sites (e.g., YouTube), image sharing sites (e.g., Flickr), hosted services, Web applications ("apps"), collaborative consumption platforms, and mashup applications.

Social networking service

Online platform which people use to build social networks or social relationships with other people who share similar personal or career content, interests, activities, backgrounds or real-life connections.

Banner in Bangkok, observed on June 30, 2014, during the 2014 Thai coup d'état, informing the Thai public that 'like' or 'share' activity on social media could land them in prison

2) user-generated content (UGC), such as user-submitted digital photos, text posts, "tagging", online comments, and diary-style "web logs" (blogs), is the lifeblood of the SNS organism,

Tumblr

American microblogging and social networking website founded by David Karp in 2007 and currently owned by Automattic.

The Tumblr login/sign up page; a different background image is displayed each time the page is loaded.
The Tumblr login/sign up page; a different background image is displayed each time the page is loaded.
Original logo of Tumblr
A Tumblr blog post shown on an information screen in a Dutch train station, 2019
Tumblr's headquarters are located in the 770 Broadway building in New York City.

The service allows users to post multimedia and other content to a short-form blog.

Social media

Social media are interactive digital channels that facilitate the creation and sharing of information, ideas, interests, and other forms of expression through virtual communities and networks.

Social media app icons on a smartphone
SixDegrees, launched in 1997, is often regarded as the first social media site.

Additionally, social media are used to document memories, learn about and explore things, advertise oneself, and form friendships along with the growth of ideas from the creation of blogs, podcasts, videos, and gaming sites.

Jerry Pournelle

Pournelle at NASFiC in 2005

Jerry Eugene Pournelle (August 7, 1933 – September 8, 2017) was an American polymath: scientist in the area of operations research and human factors research, science fiction writer, essayist, journalist, and one of the first bloggers.

Internet forum

Online discussion site where people can hold conversations in the form of posted messages.

The Wikipedia Village Pump is a forum used to discuss improvements on Wikipedia
An Internet forum powered by phpBB
FUDforum, another Internet forum software package
Internet forums are used frequently in conjunction with multiplayer online games.

Several other web applications, such as blog software, also incorporate forum features.

LiveJournal

LiveJournal homepage
LiveJournal homepage
Brad Fitzpatrick

LiveJournal (Живой Журнал), stylised as LiVEJOURNAL, is a Russian-owned social networking service where users can keep a blog, journal, or diary.

Usenet

Worldwide distributed discussion system available on computers.

A diagram of Usenet servers and clients. The blue, green, and red dots on the servers represent the groups they carry. Arrows between servers indicate newsgroup group exchanges (feeds). Arrows between clients and servers indicate that a user is subscribed to a certain group and reads or submits articles.
Usenet Provider Map
The "Big Nine" hierarchies of Usenet
A visual example of the many complex steps required to prepare data to be uploaded to Usenet newsgroups. These steps must be done again in reverse to download data from Usenet.
October 2020 screenshot showing 60 PB of usenet group data.

Today, Usenet has diminished in importance with respect to Internet forums, blogs, mailing lists and social media.

Microblogging

A broadcasting antenna in Stuttgart

Microblogging is an online broadcast medium that exists as a specific form of blogging.