A Survey of Cloud Computing and Social Networks <s> Background <s> Social networks are playing an important role in personal as well as corporate environments. However, perceived issues and evolving challenges may hinder further expansion of social networks to meet new opportunities. In this paper, we review inherent concepts and properties of social networks and highlight major analytical evaluation criteria, which are used to identify key findings that reveal degrees of benefits and shortcomings of social networks. We also discuss some proposed solutions related to decentralized social networks in the context of business implications as well as their effects on privacy, identity and trust issues. Future perspectives of social networks are also envisioned in this paper. <s> BIB001 </s> A Survey of Cloud Computing and Social Networks <s> Background <s> We present a Systematic Literature Review (SLR) on Cloud Computing that selected 39 papers from first tier journals and conferences in the period 2008-2012. The selective approach captures the relevant points of view on Cloud Computing, namely the overall paradigm in terms of delivery and deployment. Afterwards, we point out the technological issues about networking and data management in Cloud Computing. This SLR extends previous reviews thanks to a longer time period and a wider research sample. <s> BIB002
Cloud computing refers to the access of services across a network, usually the Internet. Clouds typically have a number of common characteristics such as being allocated as needed, accessible across various internet-capable devices, and metered and billed based upon resource usage. These services have a number of different labels, but essentially they can be divided into three categories -Software as a Service, Platform as a Service and Infrastructure as a Service. Software as a Service describes a cloud application that is hosted in the cloud, and is provided to its users through the Internet. This model removes the need to install an application on the end user's system and lowers the software cost through usage pricing. Platform as a Service encompasses the entire software development lifecycle. This includes the development environment, and production environment to deploy the application. Infrastructure as a Service provides the use of resources such as virtual machines, storage etc. Costs are again reduced by removing the need to procure, install and configure infrastructure. These are by no means an exhaustive list of cloud services, and may be referred to as a different name by different vendors. Cloud services generally follow four types of deployment models: Private Cloud, Public Cloud, Community Cloud and Hybrid Cloud. Private Clouds are used by a single organization. Public clouds are services provided to the public by a cloud service provider (CSP). Infrastructure costs rest on the CSP. Community clouds are where services are shared amongst multiple organizations and Hybrid Clouds mix the previous three models. One example of a hybrid cloud would be an organization that relies on both private and public clouds BIB002 . Social networks are networks of users connected through relationships such as friendship, following or otherwise. Through these relationships, users are able to share content amongst themselves. There are numerous existing social networking websites such as Orkut, Facebook, Linked.in, and Google+. On these sites, one of the greatest concerns has been the security and privacy of personal data. That is to control the personal information that is being shared to other users and social applications, as well as how information is being shared with third-parties. BIB001 .