\chapter{Concept of a Hybrid Online Social Network} \label{ch:concept} \input{content/04-concept/introduction} \section{Stakeholders} \label{sec:stakeholders} \input{content/04-concept/stakeholders} \section{Requirements to the Hybrid \ac{OSN}} \label{sec:requirements} \input{content/04-concept/requirements} \section{Restrictions} \label{sec:restrictions} \input{content/04-concept/restrictions} \section{Quality Goals} \label{sec:quality-goals} \input{content/04-concept/quality-goals} \section{Solution Strategy - Architecture} \label{sec:solution-strategy-architecture} \input{content/04-concept/solution-strategy-architecture} \section{Solution Strategy - Client} \label{sec:solution-strategy-client} \input{content/04-concept/solution-strategy-client} \section{Summary} \label{sec:concept-summary} \input{content/04-concept/summary}