A vlog or video blog is a blog (short for weblog) which uses video as the primary content; the video is linked to within a videoblog post and usually accompanied by supporting text, image, and additional meta data to provide context.
Diavlog, by the same token, is a video dialog. It follows a blog format in that it accompanies video clips with meta data relevant to the video. A diavlog could come out of a web cam recording, a video conferencing session, or even, a video by email sequence that grows with each response.
Blogs often take advantage of RSS or Atom for syndication to other web sites and aggregator software (feed readers). With development of RSS enclosures, which provide the ability to attach media files to a feed item/blog post, or the use of the Atom format (which supports rich media content by design) it is possible to bypass the mainstream intermediaries and openly distribute media to the masses via the Internet. Vlogs typically take advantage of this technological development, just as audioblogs have in recent years via the podcast boom.
As of 2006, videoblogging is rising in popularity, especially since the release of the new Apple Video iPod and the availability of iTunes Store's video content. iTunes uses the term video podcast to describe a video blog.
One of the potential problems with Vlogs is the current inability of search engines to create rich metadata or "search engine" data from the stream. For Vlogs to be fully embraced as part of web culture, some indexing solution will need to emerge.
An MP3 blog is a type of weblog in which the creator makes music files, normally in the MP3 format, available for download. They are also known as musicblogs or audioblogs. MP3 blogs have become increasingly popular since the beginning of 2003. The music posted is normally hard-to-find, often has not been issued in many years, and selections are often restricted to a particular musical sub-genre or theme. Several MP3 blogs offer music in Advanced Audio Coding (AAC) or Ogg formats, as well as MP3.
One of the first widely known MP3blogs is Fluxblog, which was created in early
2003, and continues to offer a mix of music generally centered on recent rock
and pop and offering commentary on the songs, artists, the music industry and
music in general. There are now thousands of MP3 blogs covering a cornucopia
of musical styles.
(Some definitions taken from Wikipedia, the free encyclopedia, New: Vidize.com focuses on web video recording )