Daniel Sui, professor, geography, is co-author of the article, “True lies in geospatial big data: detecting location spoofing in social media,” published in the Jan. 31, 2017 issue of the journal, Annals of GIS. The proliferation of location spoofing has stirred debate about the reliability and convenience of user-generated geospatial contents and the use of location spoofing as an effective countermeasure to protect individual geo-privacy and national security. Sui offers a quantitative approach for detecting location spoofing and a qualitative approach for probing the possible motivations of this growing practice and its inherent uncertainties.