Hi, this is Jakub - founder of Estimote, Inc. (YC S13)
Google has announced yesterday during IO in Mountain View an integration of two 1B+ users properties with beacon technology.
TL;TR - beacons can interact with users even if they don't have apps installed.
Google did great job making sure it won't introduce spam and will respect privacy.
I will be more than happy to answer any questions here.
