Most people may simply look at the headline and proclaim Facebook as the winner based on size and user base. Don't be so quick to judge without taking a good look at the key characteristics of both platforms. Grasping the differences can help shape your content strategy as well as the tactics used to connect with users.
Notice, and understand, the differences with regards to the how users behave within these networks. Facebook has become a personal escape for many; checking in on your friends' activities, benign updates about their daily rituals and a seemingly never ending stream of game invites. Google+ has almost positioned itself as a place to escape Facebook and connect people with more related interests with their ability to easily build your Circles.
The demographics also tells an interesting story. Facebook has more females and a younger user base while G+ skews towards older males.
Oddly, the infographic below doesn't mention Google+'s Knowledge Graph, but it does reference Facebook's Graph Search. Both are keys elements of the semantic web, the future of search as it relates to adding more meaning to content and connecting personas with content for improveed search results. Still early stage stuff, but important enough to be aware of as it develops and user behavior slowly shifts.
Ultimately both platforms offer tremendous opportunities for dealers. Marketers need to continue creating experiences that enable social users to explore and connect within a deeper layer of the social exploration spectrum.
Infographic credit: SocialAnex