Privacy advocates are concerned that people wearing such eyewear may be able to identify strangers in public using facial recognition, or surreptitiously record and broadcast private conversations.[1] Some companies in the U.S. have posted anti-Google Glass signs in their establishments.[85][86] In July 2013, prior to the official release of the product, Stephen Balaban, co-founder of software company Lambda Labs, circumvented Google’s facial recognition app block by building his own, non-Google-approved operating system.