A Context-aware Distributed Social Networking Framework


i3B (Valencia, Spain)



Grant agreement number

This project has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement Nº 825585


Teknologian Tutkimuskeskus Vtt Oy

Atos Spain Sa Atos Spain

Ethniko Kentro Erevnas Kai Technologikis Anaptyxis

Grassroots Arts And Research Ug (Haftungsbeschrankt)

Istituto Superiore Marioboella Sulle Tecnologie Dell’informazione E Delle Telecomunicazioni Associazione

Nagoon Ab

Swiss Txt Ag Swiss

The Provost, Fellows, Foundation Scholars & The Other Members Of Board Of The College Of The Holy & Undivided Trinity Of Queen Elizabeth

Universita Di Pisa

Universitat Autonoma De Barcelona

Universitat Politecnica De Valencia

Universitat Passau Uni

Helsingin Yliopisto

Worldline Iberia Sa



HELIOS is a platform

HELIOS will develop, implement and validate a decentralized social media platform that will address the dynamic nature of human communications in three dimensions: contextual, spatial and temporal. Technically, this platform is an extension for mobile operating systems (first Android), providing easy-to-apply peer-to-peer social media functionality for 3rd party developers. HELIOS will be built in a modular and extensible manner, by enabling all features characterizing social media today and growing beyond.

Trustworthy communications

HELIOS will introduce novel concepts for social graph creation and management, which are grounded in trust. It will design, implement and validate a state-of-the-art, decentralized p2p social media platform which will:

  • Support the ad-hoc creation and management of social graphs within the context and proximity of the user.
  • Provide all necessary means and features which will entitle it to represent true trust-by-design, including among others novel decentralization, content creation and sharing.
  • Ensure the highest level of privacy complying with all the necessary ethical and legal requirements. The concept will be validated in different open and closed environments with citizens across a range of demographics and within different contexts.

Egocentric contextual networks

We see our own networks from egocentric perspective: at work our social network comprises our colleagues and associates, and we seldom think any further than that. In HELIOS terminology, we ourselves are ‘Egos’, while the people we are connected to are our ‘Alters’. However, each of us has more than one network, as we have different networks at work, at home and in hobbies: All our social networks are contextual, and the contextual networks stack one upon another. In HELIOS, the platform automatically maintains this contextsocial information, important for online communications. Data remains within each context and does not leak to other networks.