Mobile social networking is growing rapidly, with 46% of people accessing Facebook via mobile. This presents new opportunities for brands to engage audiences in new contexts. Existing social networks like Facebook are prioritizing mobile to remain relevant, while new entrants like Apple and Google are entering the space. Early brand campaigns leveraging check-ins on networks like Foursquare have seen success driving foot traffic. However, the space is still immature, and both networks and brands must work to effectively monetize mobile social opportunities.