Randagodron@Infoseepage @campuscodi I guess that the "sniffers" did not "just listen to packets" but sent pings or equivalent probing signals to find networks. Thus easy to identify. On a lower-level, as far as I know even "only listening to radio signals" can be detected with accurate enough equipment, since radio receivers have a local oscillator for demodulation, and the oscillation "bleeds" through the receiving antenna and emits a small though detectable signal.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.