Also, there are social networks created to search for objects of one’s interest: web sites, listening to music, reading books and so on.
In the social network you can usually publish information about yourself (date of birth, ducation, hobbies, etc.), based on which other participants can find you. One of the common features of social networks is the "Friends" and "groups".
For advertisers, social networks provide unique opportunities for direct contact with consumers. Every day, millions of users discuss companies, their products and services by sharing their opinions and impressions. As a result, network community can ruin (or vice versa), the reputation of a company with multi-million dollar turnover.
Many people do not realize that information posted on social networks can be found and used by anyone, including those who not necessarily have good intentions. Information about social network users can be found by their employers, parents, children, former or current wives or husbands, debt collectors, criminals, law enforcement and so on.
Blog is a web site, which main contents include regularly added entries that contain text, images or multimedia. Brief entries sorted in reverse chronological order (most recent entry on top) are common for blogs. Blogs are usually public and involve the reader, who may enter into a public debate with the author (in the comments to blog posts or their blogs).
People writing a blog are called bloggers. Combination of all blogs is called a blogosphere.
Blogs main characteristic is the ability of visitor to publish feedback (comments). This feature makes blogs a part of a social network environment that is more advantageous than e-mails, newsgroups, Web forums and chat rooms.
Sources: http://en.wikipedia.org/wiki/Blog
http://www.whatissocialnetworking.com/
http://radio-weblogs.com/0121664/categories/knowledgeManagement/
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