Blogs have become so common and easy to use that about 50,000 are started each day. One great use of a blog is to share family stories and pictures. You can make a blog for each of your different family lines and then post information about each ancestor that has that last name or that belongs to that ancestral line. Wordpress and Blogspot are the two blog sites that are used the most, plus they are free. They have some great tutorials to help you get started and design your blog.
Here are a couple of blogs that I have made for two of my family lines. They are just an example of what you can do. I also have a private blog that just my immediate family can see where we share pictures and memories about when our children were growing up. (You can have your blog public so anyone can see it or private so only invited guests can see it.)
Go ahead and start a blog and see how it works. Experiment until you have it just the way you want and then you can make it public and tell your family about it. When it is public, other relatives can find it by searching for certain family names and will see what you have and could contact you and share information. It is a great way to share pictures and stories from your family.