Tumblr
Tumblr is a popular microblogging platform. It allows you to post short messages, pictures, links, audio easily. Because of its easy-to-use interface, Tumblr could be a great tool to track information about oneself. You can write short-form posts about your activities, take pictures to represent your activities, and record sounds. Since it's a microblogging site, your posts will be shown as a list of blog posts. If you want to visualize your data, you can fetch your data using their API, which you can feed to visualizations that you make.