Blogging is a method of expressing yourself while also sharing your thoughts/activities with others. Some individuals put everything out on a blog, while others put just highlights of specific activities.
A blog can also be used as a method of getting feedback from others on ideas for articles or stories. If you are going to use a blog in this manner, you must be prepared for both positive and negative feedback.
Blogging can also help in resolving writer's block, as it's a means of getting ideas documented and available for future use. A blog can be a public method of tracking ideas which can be easily accessed no matter where an individual is, as internet access is all that is required to retrieve information. Looking back through even a personal blog can spark ideas and bring back memories.
One thing I see people forgetting is that once they post something on the internet, it's available for everyone to see. Some memories are best to be documented privately and not through blogs, as they will be around for years to come. An example of this is writing about a child and their activities, as this information will be available when this child grows up, and would they really want the embarrassing stories/activities known by everyone.
Blogging can be a great method of sharing information, but it's important to think about what you are posting. A blog if on the internet can be available to search engines, so it can be found by anyone, not just by those who follow you.