Google has added this feature as a "social function" in order to keep pace with Facebook. This button appears on the organic search results and also appears on the ads. However, I did not see the +1 feature run on the maps section. When you find a search result that you like and think that it will be helpful to your social circle click on the +1. Google will then keep track of your +1's on your Google profile. Also, anyone from your social circle(Google's social circle not Facebook)when they perform a similar search.
This is most impact will take place with advertisers and AdSense according to TechCrunch Magazine:
"The key that Google isn’t really touting yet is that +1 data can be used to make ads social not just on Google Search result pages, but also across the whole web. If you have a site that runs AdSense ads, it may now feature +1 data in addition to the ad. And these newly social ads require no changes from advertisers. The bidding model doesn’t change at all and as a bonus +1 data will now be included in reports, Google’s Christian Oestlien says.
Guess who else would like to do the same thing with ads across the web given the social data that they have? Yep — Facebook."
The war for your attention on the internet heats and I have a lot of questions. Feel free to respond in the comments section.
1. Will these +1 (likes) have an effect on search rankings?
2. Can I buy 100 likes for $5 and rank above my competitors?
3. How will Google regulate this feature?
4. How far is ahead is Facebook compared to Google?