Social Networks and P2P Advertising

Social networks are here and now and have become a large part of the Internet spectrum.
Surfing, browsing or clicking away on the Web over the course of two decades occasionally reminds of old Web sites or old Web services. One Web service that popped to mind is the first search engine multi-submit services that provided a way for its users to post URLs to many search engines from a single form. Multi-submit services exist today, but there is no need for webmasters to submit URLs to the major search engines since they will find it somehow and index automatically.
Social networks are the hot topics in today's Web trends. The eyes of the media are looking at social networks. The eyes and pens of bloggers are focusing on social networks. It is fashionable to join a social network and connect with online friends. The social networks are more than a vehicle for people passing time. Social networks are already big online business (depends a little bit on how one looks at it) and they are advertising and marketing machines.