Il me semble que ce sujet est en plein dans les travaux du groupe de lutte contre l'illectronisme mené par le SIILAB et le CCAS d'Amiens.
Je vais attirer leur attention sur ce post.
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They use it because they want more features so that they can easily keep an eye on their friends or others. There are many apps that are being used but they are very good to have, very handy.