A lot of blogs tend to be of the "personal" type. These are along the lines of daily updates and that sort of thing. Other blogs, like this one, have a focus. Deviating from this focus would be detrimental to the blog's growth. There are times when you can get away with it, but early on, you want to make sure you are keeping your focus.

Imagine if after a month or so of reading this blog you stumble across a post about how to play No Limit Texas Holdem. Clearly this is not the right spot for a poker related post as the goal here is to improve your blog. What purpose does a poker post serve here? Nothing really.

Another reason to keep your focus is that certain keywords will keep coming up. Probably in the case of this blog, the word "blog" will pop up a lot. Now the word blog is a pretty generic term and there are litterally millions of hits on Google for the word blog. But Google is smart and they know when a site is about a topic. So if after a year or so of me keeping this site going, searching Google for the word blog, might return this site.

The other reason to keep a focus is for getting other people to link back to you. Say you have a blog about cruises. This blog covers everything from what ships to sail, where to sail, what to do on the boat, excursions, photos and more. Now where would you want to find a link back to your site? On another cruise site? Yes. On a vacation site? Yes. On a site devoted to hockey? Nope. Just something to keep in mind.