SEO (search engine optimization) poisoning sounds like a serious problem, and it is. Basically, hackers make a bunch of malicious websites on a certain topic and then trick Google into pushing the sites up near the top of the search results for that topic.
When you search for the topic, you'll have a good chance of running into one of those sites. Once on the site, it will attack your computer looking for weak spots to slip a virus on to your system.
Or you might see a link to download pictures, video or a program. Of course, anything you download is going to be a virus.
One of hackers' favorite topics to use for SEO poisoning is celebrities - that's what a lot of people search for online. The most dangerous celebrity to search for changes every so often as fame grows and fades.
Anti-virus software company McAfee keeps track of the most dangerous celebrities and has released the list for 2014. So who took top honors this time around?