If it is your birthday, then Google displays a special Happy Birthday doodle on your birthday on Google.com! It was my birthday recently and it was surprising to see a new Doodle instead of the usual FIFA google doodles images which are displaying now everyday. At first I did not realize what was special about the logo, till I hovered over it and the title said Happy Birthday!
It is well known that if you click the special Google doodles, they click through to the search results for the event. In this case, the happy birthday logo clicked to my Google+ profile page. Here is what my Google front page looked like as it loaded in my Chromebook.
Don’t see the logo on your birthday? If it your birthday and you are logged into Google, and have a Google+ profile with a date of birth entered – then only you will see the special logo. Google will identify if it your birthday from the Google+ settings that day and will display the special logo full of cakes, pastries and sparklers. If you hover the mouse over the logo, it displays Happy Birthday [Name]. And when you click on the logo, you get directed to the Google+ profile page.
It was interesting and indeed a great idea by Google to display a custom logo. If it is your birthday, they did you see the same or different logo?