This paper reports on our early experiences with the design of Social TV for senior citizens. Even though there seems to be a straight forward match between new interactive TV technologies on the rise and the notion of supporting social interaction amongst elderly TV viewers it is not at all clear how these technologies can accommodate the specific challenges related to the everyday life of eld...

Decentralized online social networks (DOSNs) have adopted quite coarse-grained policies for sharing messages with friends of friends (i.e., resharing). They either forbid it completely or allow resharing of messages only without any possibility to constrain their subsequent distribution. In this article, we present a novel enforcement mechanism for securing resharing in DOSNs by relationship-ba...

One of the fundamental questions concerning inside money is whether its issuers should be regulated and how. This paper evaluates the e¢ ciency of one prevalent regulatory recommendation –a requirement that private issuers redeem inside money on demand at par – in a random-matching model of money where the issuers of inside money are only imperfectly monitored. I …nd that for su¢ ciently imperf...

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License: http://creativecommons.org/licenses/by-nc-nd/4.0/ Abstract As people share increasing amounts of information with their online social networks, managing which information should be sent to whom is cumbersome. As opposed to having people prespecify access control ‘policies’ we advoca...

In the last 50 years the shape of cities has changed dramatically. People have started to migrate from rural areas, attracted by the opportunities created by a more dynamic economy and by the apparent easier life within the cities. This trend has been observed in Europe during the whole 20th century, but has now considerably slowed down, to the benefit of smaller urban centres, which have grown...