What's the purpose?
Well, the answer to that question can be many different things. Different people choose to blog for different reasons. Some do it to create awareness for a cause such as a disease, or a company they feel they have been wronged by, or to share their enthusiasm for a particular sporting team. However, the majority of the millions of blogs that are written on a daily basis are simply people (including myself) wanting to share some part of their lives with family and friends.
Anyone that goes and reads blogs on a regular basis should keep this in mind. No matter why the blog was written, chances are, it was written with a specific audience in mind. To that end, the reader needs to be aware of the intended audience.
I am not saying people can not read anything where they are not the intended audience. It is after all, posted on the internet for the world to see, and each and every blogger has the right and ability to limit their readers if they really want to do so. However, most bloggers don't want to do that. The reason for blogging in the first place is to have your opinions heard, and that can't happen too well when you are purposely limiting the number of potential readers.
Knowing and being conscious of the intended audience will help you, the reader, to be able to place the proper perspective on what is being said. For example, if a blogger is wanting to vent frustrations, chances are they will do so without pointing fingers and putting names, companies, or anything else directing specifically towards anyone. To the contrary, bloggers aiming to discredit a specific company, doctor, product, or whatever the case may be, will almost always be very direct and specific about the subject and cause of their frustrations. Please keep in mind, we are talking about the internet here, and there are millions of blogs and posts, so of course there are exceptions.
Anyway, I guess the bottom line is just that. It is the internet, and there is a little of everything out there. The public blogsphere is primarily made up of people simply wanting to share and get things off their chest. It is not a source for news or gossip. There is a reason for the saying "don't believe everything you read online". The blogging world is made up of people's opinions, nothing more.
I apologize for the long post. Have a good day, and happy blogging to all!