Security in the Internet

It´s information security as applied to computers and computers networks. Thne field covers all the processes and mechanisms by which computer-based equipment, information and services are protected from unintended or unauthorized access, change or destruction. Computer security also includes protection from unplanned events and natural disasters.

Computer protection: there are numerous ways to protect computers, including utilizing security-aware design techniques, building on secure operating systems and installing hardware devices designing to protect the computer systems.

- Security and systems design: although there are many aspects to take into consideration when designing a computer system, security can prove to be very important. Many organizations are improving security and many types of ciber-criminals are finding ways to continue their activities. Every type of ciber attack is on the rise. 

- Security measures: a state of computer sucurity is the conceptual ideal, attained by the use of three processes: threat prevention, detection and response. These processes are based on various policies and system components, which includes the following: 

. User account access controls and cryptography can protect systems, fails and data.

. Firewalls are by far the most common prevention systems for a network security perspective as they can shield access to internal network services, and block certain kinds of attacks through packet filtering.

. Intrusion Detection Systems are design to detect network attacks in progress and assist in post-attacks forensics, while audic trails and logs serve a similar function for individual systems.               

. Response is necessarily designed by the assessed security requirements of an individual system and may cover the range from simple upgrades of protections to notification of legal authorities, counter attacks, and the like.

          

What is a Social Network?

A Social Network is a social structure made up of a set of social actors and a set of the dyadic ties between this actors. It perspective provides a set of methods for analyzing the structure of wholea va social entities as well as a variety of theories explaining the patterns observed in these structures.

In the late 1800´s, Émile Durkheim and Ferninand Tönnies foreshadowed the idea of social networks in their theories and research of social groups. Tönnies argued that social groups can exist as personal and direct ties that eather link individual who share values and belief or impersonal, formal and instrumental social links. Durkhaim gave a non-individualistic explanation of social facts, arguing that social phenomena arise when interacting individuals constitute a reality that can no longer be accounted for in terms of the properties of individual actors.
George Simmel, writing at the turn of the twentieth century, pointed to the nature of networks and the effects of network size on interaction and examined the likelihood of interaction in loosely knit networks rather than groups.
In the 1930´s Jacob. L Moreno began systematic recording and analysis of social interaction in small groups, specially classrooms and work groups.
 In anthropology, the foundation for social network theory is the theorical and ethnographic work of Bronislaw Malinowsky, Alfred Radcliffe- Brown and Claude Lévi-Strauss. Max Gluckman, John A. Barnes, J. Clide Mitchell and Elizabeth Bott Spillius performed one of the first fieldworks from which network analysis were performed, investigating community networks in southern Africa, India and the United Kingdom.
In sociology, Talcott Parsons set the stage for taking a relational approach to understanding social structure. Peter Blau provides a strong impetus for analizying the relational ties of social units with his work on social exchange thheory.
Mark Granovetter and Barry Wellman are among the former former student who elaborated and championed the analysis of social networks.

Micro leves of social networks:
- Dyadic level: a dyad is a social relationship between two individual. Network research on dyads may concentrate on structure of the relationship, social equality and tendencies towards reciprocity/mutuality.
 - Tryadic level: research at this level may concentrate on factors such as a balance and transitivity.
- Actor level: the smallest unit of analysis in a social network is an individual in their social setting. This level focuses on social characteristics such as size, strenght, density...
- Subset level: research problems begin at the micro-level such as distance and reachability, cliques...

What is Prezi?

Prezi is a cloud-based presentation software and storytelling tool for presenting ideas on a virtual canvas.

Prezi was created by the support of Kitchen Budapest and Magyar Telekom in 2008 in order to replace the ordinary slade based presentations. The actual development was done by Zui Labs led by its three Hungarian founders Péter Árvai, Szabolcs Somlai-Fischer and Péter Halácsy. The word prezi is hungarian short form of presentation.

Products and features:
- Prezi ZUI: the Prezi online and offline Zui editors employ a common tool palette, allowing users to pan and zoom, and to size, rotate, or edit an object. The users places objects on a canvas and navigates between videos, images, texts and other presentation of media.

- Prezi Desktop: it allows Prezi Pro or Edu Pro suscribers to work off-line, create and save their presentations on their own Windows or Mac (but not Linux) systems.

- Prezi Collaborate: it´s an online collaboration feature that allows up to ten people to co-edit and show their presentation on real time.Users participate in a Prezi simultaneously, and each is visually represented in a presentation window by a small avatar.

- Prezi viewer for iPad: it´s an app developed for an iPad for viewing prezis created in one´s Prezi online account.

Revenue model
Users who use the product´Public license must public their work on the prezi.com website, which is publicly viewable. Customers who pay for PreziEnjoy or PreziPro can make their presentations privately.

Prezi is uses for businness, conferences, educations and information visualization.

And for last, I have done one work of Prezi if you want to see it, it´s in:
http://prezi.com/9zjwfkenlh8d/?utm_campaign=share&utm_medium=copy