The file anonymized_app_data.csv contains a sample of smartphone app-fingerprints from 20,000 randomly selected individuals, collected in May 2016.
Each record in the table corresponds to a (user, app) pair, and reveals that a given app was used at least once by a given user during May 2016. The table contains the following field:
user_id : hashed user id
app_id: hashed id the smartphone app
The data accompanies the publication: "Temporal and Cultural Limits of Privacy in Smartphone App Usage"