Anyone can share their thoughts.
Some gifted writers in generations past were known for their personal diaries and journals. In today's Social Web, anyone can have a blog -- basically a public journal. Clearly, some are better than others, but the average person has probably never had the freedom of expression than he/she has today.
People blog about politics, sports, their travels, experiences, familes, pets, gardens, cooking preferences -- whatever. You can create a blog to express anything you want it to, or to communicate any message you wish to put out there. The collection of these blogs is social in nature itself, by the interaction and discussions ON the individual blogs makes the social dynamic even greater.
Blogs are just one of the social web tools available to people today. We've looked at plenty of others in class today. Now, it's your turn. Explore, participate, interact. It's YOUR Internet.