11. The ability to create and update content leads to the collaborative work of many rather than just a few web authors. In wikis, users may extend, undo and redo each other's work. In blogs, posts and the comments of individuals build up over time.
12.
13. Categorization of content by users adding "tags" - short, usually one-word descriptions = to facilitate searching, without dependence on pre-made categories. Collections of tags created by many users within a single system may be referred to as "folksonomies"
17. The use of syndication technology such as RSS to notify users of content changes.
18.
19. RSS is a family of web feed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format.
20. Web feeds benefit publishers by letting them syndicate content automatically. They benefit readers who want to subscribe to timely updates from favored websites or to aggregate feeds from many sites into one place.
21.
22. An Internet forum, or message board, is an online discussion site. It originated as the modern equivalent of a traditional bulletin board, and a technological evolution of the dialup bulletin board system. From a technological standpoint, forums or boards are web applications managing user-generated content
23.
24. A blog is a type of website, usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video.
25. Entries are commonly displayed in reverse-chronological order. "Blog" can also be used as a verb, meaning to maintain or add cont ent to a blog.
26.
27. A social network service focuses on building and reflecting of social networks or social relations among people
36. Twitter is without a doubt the best way to share and discover what is happening right now.
37.
38. Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the world.