You should write about whatever you like, talk about whatever you like. Even if you have one line, share it, its a thought, furthermore, its your thought and its your blog.
I HIGHLY RECOMMEND that you join Tumblr (http://tumblr.com) Its a blogging service thats absolutely great because 1) It has a directory, (http://tumblr.com/directory) , so you can follow blogs that that talk about your interests.
2) It has a reblog feature, which means, when you like a certain post, you click reblog, and then you tag it and click Reblog Post, so then the post will end up on your blog, with a mention of whom you reblogged it from...its like the Retweet feature from Twitter.
3) Its very simple, and very visual...though there are blogs that wordy, tumblr is more about visual stuff, like photos and art, so if you have any, post it.
If you want to know more about tumblr, leave me a message on one my tumblr blogs (links below) I could help introduce you and tell you more about it if you ever join Tumblr
Hope that helps, remember, keep calm, and move along, it'll all be fine

*Panda hugs*
P.S. Its live, in that sentence you asked.