A blog (a truncation of the expression weblog) is a discussion or informational website published on the World Wide Web consisting of discrete, often informal diary-style text entries ("posts").

Posts are typically displayed in reverse chronological order, so that the most recent post appears first, at the top of the web page.

Until 2009, blogs were usually the work of a single individual, occasionally of a small group, and often covered a single subject or topic.

In the 2010s, "multi-author blogs" (MABs) have developed, with posts written by large numbers of authors and sometimes professionally edited.

MABs from newspapers, other media outlets, universities, think tanks, advocacy groups, and similar institutions account for an increasing quantity of blog traffic.

The rise of Twitter and other "microblogging" systems helps integrate MABs and single-author blogs into the news media.

Blog can also be used as a verb, meaning to maintain or add content to a blog.

A media event, also known as a pseudo-event, is an event or activity conducted for the purpose of media publicity.

It may also include any event that is covered in the mass media or was hosted largely with the media in mind.

Media events may center on a news announcement, an anniversary, a news conference, or planned events like speeches or demonstrations.

Instead of paying for advertising time, a media or pseudo-event seeks to use public relations to gain media and public attention.

A fact is something that has occurred or is correct.

The usual test for a statement of fact is verifiability—that is, whether it can be demonstrated to correspond to experience.

Standard reference works are often used to check facts.

Scientific facts are verified by repeatable careful observation or measurement (by experiments or other means).