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Definition Blog

from http://www.marketingterms.com/dictionary/
A frequent, chronological publication of personal thoughts and Web links.

Information

A blog is often a mixture of what is happening in a person’s life and what is happening on the Web, a kind of hybrid diary/guide site, although there are as many unique types of blogs as there are people.

People maintained blogs long before the term was coined, but the trend gained momentum with the introduction of automated published systems, most notably Blogger at blogger.com. Thousands of people use services such as Blogger to simplify and accelerate the publishing process.

Blogs are alternatively called web logs or weblogs. However, “blog” seems less likely to cause confusion, as “web log” can also mean a server’s log files.

see also http://en.wikipedia.org/wiki/Blog

Definition Social network

from http://en.wikipedia.org/wiki/Social_network

A social network is a social structure made up of individuals (or organizations) called “nodes”, which are tied (connected) by one or more specific types of interdependency, such as friendship, kinship, common interest, financial exchange, dislike, sexual relationships, or relationships of beliefs, knowledge or prestige.

siehe auch eine Übersicht der Funktionen unter http://de.buddypress.org/about/