Second lesson of IS

Today, i went for the second lesson of my Info-comm Studies. I learnt about Human-Computer Interaction (HCI) and Web 2.0 technologies. Now, we can send messages in a email to the person within a few seconds, rather than writing a letter and let the postman deliver to the destination in the olden days. I think soon, we will be able to interact or even communicate with computers, and then everything would be much more easier. However, there are also disadvantages about it. Such as when we use the computer, our body do not have to move too much and we can send the message, unlike in the past, we have to go to the post office and deliver it. I also learnt that social networking is a great way to meet friends but we must be careful not to give any information such as our name, school and address in our profiles in case other people find this information and use it to track us down. Those people could easily disguise as your friend and do bad things to you. Also, who knows when you are in a chatroom with your friend, a person might just go in and listen to the conversation?