Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 39 to 43.

The 21st century has become another important century for inventions and discoveries. We are only in the 2nd decade of this century currently but we have already witnessed many big innovations that have drastically changed our way of living. Bluetooth technology, broadband internet, artificial heart, genetic engineering, virtual reality, 3D printing are some to name a few. These inventions are changing the way we live, do our things and communicate with the others. Even though some of these developments are in the early stage of innovation, they have a more sophisticated and promising future. Social media is one of the most important aspects that has affected each person in this modern time.

According to Heidi Cohen, Social Media are the platforms that enable the interactive web by engaging users to participate in, comment on and create content as means of communicating with their social graph, other users and the public. The power of social media has changed most of the things in our daily life. Social media has revolutionized and completely changed the way we send and receive information. It is more interactive, can be done in realtime and uses a wide number of media like text, audio, video, pictures, graphics and more. With these sites, sending and receiving messages offline and in realtime, audio and video chatting, sharing pictures, video and text, going “Live” to many audiences, meeting old friends and making new has revolutionized our way of establishing connections with others.

There are also the negative sides of the innovation of social media and their usage. Increase in cyber-crime, invasion of privacy, security threats etc. is some of the issues associated with social networks. But at the same time social networks are working themselves to cope with the increasing problems that arise with the improper use of it. With more and more sophistication and versatility of use, social media have undoubtedly proved to be a boon to connectivity and social interaction between people in this age of communication and information technology.

(Adapted from https://arjungelal.wordpress.com/)

What does the word “it” in paragraph 2 refer to?