Google started integrating +1 to the network's ads

Personally I expected Google to do that. Google has just made their ads more social , a move to insure themselves because ofthe increasing rumors recently about the intention of the launch of Facebook ad network to compete with Google's network.
Starting from next October, Google will begin to add the +1 button next to the adsthat appear within the interactive sites that use AdSense and the user will be able to admire this ad by clicking on the +1 button which will be located under the ad.
This new feature will also gain more users for Google+, because you'll need to be Signed up for a Google account to be able to use it.
The question is, don't you think this's weird?, why did Google announce this feature near Facebook's F8 date?