Marketing has changed.

Traditional advertising does not work, brochure-like websites do not work, the web has given people ultimate freedom of choice and of goods. When there are no monopolies and constrictions, interrupting people's lives is not effective marketing anymore. 
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There are no secrets. The networked market knows more than companies do about their own products. And whether the news is good or bad, they tell everyone. – Cluetrain Manifesto
If the news is important, it will find me” – some random mySpace user
An online marketer now needs to find where people are congregating online and needs to engage them in a meaningful way. Be it in matching with what they are looking for, watching how they interact and understand what they’d like or listening to their natural opinions on your company or market and reacting to that.
Google
Google is the most used search engine and is used more each day. Google's share of the search market is growing, not declining. Each month Google is used by more and more people in the English speaking world and many are jumping shop from Yahoo! and Live.com to start using Google. People who already use Google start using it more frequently too. It is almost addictive.
Search engines themselves are changing. They are being used for more and more things. Website owners and bloggers find they are using Google to search their own properties as it is so effective. People are using Google as a spellchecker, as a calculator and as a unit converter. People search Google for the latest news. Google is the jumping point for web destinations but also as a Swiss army knife for non web actions such as spelling, as mentioned above.
Many Irish people instead of typing in Bebo.com in the address bar actually go to Google and search for Bebo and then click on the result to bring them to the site. Consider the amount of trust Google now has for people to do this.

It makes sense then to try and engage with people on Google since that's where they start so many of their digital actions. It’s a trusted place for them. You can react to someone’s searches by making sure your website ranks well in search results (SEO) but since you cannot rank well for every single search result, you can reach these people by advertising next to search results with relevant ads (Adwords)