Monday, March 14, 2016

Facebook Will Have More Dead Users Than Living Ones By 2098


 By 2098, Facebook will be home to more number of dead people than the living ones by 2098. This prediction was recently made by Hachem Sadikki, a PhD candidate at the University of Massachusetts. Sadikki’s study is based on the fact that Facebook refuses to delete the dead users automatically and the website’s growth will soon begin to slow down.
Facebook is on its way to become the world’s biggest virtual graveyard by the year 2098. By the end of this century, the number of dead people will outnumber the living ones on the social networking website, according to a statistician.At the moment, Facebook has about 1.5bn users spread across the world. This unimaginable situation could arise due to Facebook’s decision of not deleting dead users automatically. Instead, it leaves their profiles up as memorial pages. If we take a glance at the data, this year alone, more than one million Facebook users are predicted to die. Compared to the number of 385,000 in 2010, this number is very huge.
According to Hachem Sadikki, a PhD candidate at the University of Massachusetts, who made this prediction, the slow growth in the number of new users is also responsible.
As most people don’t share their Facebook password with friends and family, their profile stays alive even after their death. This has been upsetting in some cases in the past when dead people still appear as having birthdays in their friends’ News Feed. The account can be deleted only if someone with the passwords log in and closes it down. 
Facebook also lets people appoint a ‘Legacy Contact’ that can post one last post after their death and change their profile picture and cover photo.

What Is Star Topology? Advantages And Disadvantages Of A Star Topology



What is Star Topology?

A star topology is a network topology in which all the network nodes are individually connected to a central switch, hub or computer which acts as a central point of communication to pass on the messages.
In a star topology, there are different nodes called hosts and there is a central point of communication called server or hub. Each host or computer is individually connected to the central hub. We can also term the server as the root and peripheral hosts as the leaves.In this topology, if nodes want to communicate with a central node, then they pass on the message to the central server and the central server forwards their messages to the different nodes. Thus, they form a topology like the representation of a star.

How does communication happen in a Star topology?

Let’s say all the computers of a floor are connected to a common hub or switch. The switch maintains a CAM table in this case. The CAM table is Content Addressable Memory where hardware addresses of the all the connected devices are stored inside a memory in the switch.
For example, if computer A wants to send a data packet to computer B then computer A will forward the message to the switch. The switch will check the address of the destination computer and forward the message to the same.
In the case of a hub, a hub has no memory of its own. So when computer A sends a message to computer B, then hub announces “Hello all the ports connected to me, I have got a packet for this address. Who of you has this address?” This procedure is called ARP (Address Resolution Protocol) and using this network protocol the hub is able to find the address of the intended machine and hence, it transfers the packet to the destination machine.

Advantages of Star Topology:

  • Less damage in case of a single computer failure as it does not affect the entire network

Disadvantages of Star topology:

  • More cables are required to be connected because each computer individually connects to the central server
  • Single point of failure in case the server get down.