What Can I Do To Rectify This?
There are a few steps you can take to clean up your online act. First, Google yourself. See what is out there that has your name on it. If there's questionable content, take steps to delete the content from the web. Remember that anything posted online, even if you delete it, remains in the cache for quite some time.
Second, set up Google alerts to track your name and any names you go by online. This way you can see what you're saying and what's being said about you, every time there's a post. It also helps you to know whether anyone sharing your name is out there posting controversial material, so you can have a case should this become an issue.
Third, consider this piece of advice from BNET: Don't post anything online that you wouldn't want to have featured on the cover of The New York Times. If Anthony Weiner had followed that advice, he might have thought twice about sending out provocative pictures online. Don't post anything you wouldn't stand behind in several months time.
Fourth, if you have slipped up in the past, make a resolution to not do so in the future. Some people believe swearing in a blog is quite offensive. You can often go back and clean up curse words, make rants less offensive, and censor your blog. You especially want to do this if you're going on the job market soon.
Fifth, if you wouldn't want your grandparents to read it, it shouldn't be on your blog. It's that simple. Parents might be too modern to give you an objective feeling, but Grandma and Grandpa might object to seeing pictures of you holding a beer bottle in your hand. By that same philosophy, if you could get arrested for it, you don't want to post about it on your blog. Freedom of speech is great, but with Internet searches being used in murder trials, you might want to think twice about posting information that could implicate you. Plus, it makes you a risky candidate for a job. How would your company feel if they knew you did x, y, and z in your spare time? It should be common sense, but a surprising number of people do this.
Finally, (and perhaps most importantly) always be courteous to others. Don't ever say mean things, act in an aggressive manner, or bully another person online. In fact, don't do or say anything on your blog that you wouldn't do or say should that person be standing in front of you. Sometimes the seeming anonymity of the Internet gives users courage they otherwise wouldn't have. Don't give into the temptation to say whatever comes into your mind. If you're upset, angry, or elated, write your post. Save it. Walk away. Come back tomorrow. You'll often find this saves you a lot of embarrassment (and in many cases, your job).