Others function as more personal online diaries, and others function more as online brand advertising of a particular individual or company.
A typical blog combines text, digital images, and links to other blogs, web pages, and other media related to its topic.
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.
Blogs can be hosted by dedicated blog hosting services, or they can be run using blog software, or on regular web hosting services.
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.
In the 1990s, Internet forum software, created running conversations with "threads".
Threads are topical connections between messages on a virtual "corkboard".