A small transparent plus one button will appear near your search results (log into your public Google account first), when you click on it, it should turn blue; this indicates that you have +1'd that particular link, it will appear on a new tab in your account which keeps a record of the various things online that you have +1'd (the plus one tab).
You can keep this tab public or private as per your choice. When you plus one something, you say to the world "hey this is cool, come have a look."
It also helps you find things in search by counting the number of "+1s" a site or advertisement has received. The number of "+1s" a site gets indicates its popularity.
For example, let us take a case of a site based on gardening. If there are 200 people who have +1'd the site along with a friend (XYZ) of yours; it will be displayed below as – "XYZ along with 199 others +1'd this link".
Note: Google search is a not a living thing with independent thought and thus cannot understand the complexity of human connection and perceptions. Google +1 helps to quantify the process by calculating the number of plus ones a site receives and thus improves the accuracy of its search.
The Google +1, just like the Facebook "like" will be posted inside sites and on various advertisements making the task of our daily searching a very socially engaging concept.
"Be Honest to You, not to others"