  Social Internet of Things (SIoT) takes a step forward over the traditional
Internet of Things (IoT), introducing a new paradigm that combines the concepts
of social networks with the IoT, to obtain the benefits of both worlds, as in
the case of the Social Internet of Vehicles. With the emergence of the Social
Internet of Things, new challenges also arise that need to be analyzed in
depth. In this article, the key challenges around the software architecture of
the various SIoT system described in the literature are analyzed. One of the
conclusions is that SIoT is still at an early stage of development, and
therefore, SIoT systems architecture will be concerned by this fact.
Challenging quality attributes specific for SIoT include scalability,
navigability and trust
