On Verfassungsblog an interesting series of articles was published, with surveillance as theme: Eyes Everywhere: Surveillance and Data Retention under the EU Charter, articles are e.g.:

• A Right to Anonymity in the Digital Age, Sarah Stummer
• Data Retention Laws and La Quadrature du Net II, Marcin Rojszczak
• Squaring the Circle, Aqilah Sandhu
• New Media, New Data and a Dark Foreboding, Thomas Christian Bächle
• Testing the Waters of Private Data Pools, André Bartsch, Johanna Fink, Jakob Mutter, Marc Bovermann, Isabelle Weiss
• Data Retention in a Cross-Border Perspective, Chiara Graziani
• The Long and Winding Road, Giulia Formici
• Of Minor Benefits and Major Costs, Elif Mendos Kuşkonmaz
• Eyes Everywhere, Erik Tuchtfeld