Figure 2
From: Analyzing the longitudinal impact of proximity, location, and personality on smartphone usage
Average active traffic for different Bluetooth proximity densities. Four types of proximity are compared including any (i.e., any detected Bluetooth device), project (i.e., only NetSense devices via Bluetooth), SMS friends (i.e., send or receive at least one text message per month on average), Facebook friends (i.e., on Facebook friend list) at (A) semester 1, (B) semester 2, (C) semester 3, and (D) semester 4.