Depending on how much personal information you post on your blog, you can choose to change privacy settings to a high level in order to protect your privacy. If you’d like to make a particular post private so that only you or a bunch of people you choose can see it, all you need to do is head to the post editor and click on Visibility in the Publish pane.  You can choose to make the post either password protected, in which case you’ll need to supply a password, or private, which means only that you or other blog contributors will be able to see it.  Click OK and that will be made effective immediately.