Well, it depends on what side you are on. Which is better or more useful for you, social networking or the traditional way of communication? Then you have to give the pros and cons of each. For social networking, you can say something like "Social networking is very useful because you get to share things online, but is risky because anyone in the world can see your posts" or "Writing letters is more useful because it can be private, or the only ones who will see the letter will be the sender and the receiver, but the negative side is that it may take a long time to get the message to the receiver."
I know I know it's already past the deadline, but I don't know maybe you still haven't done your speech yet, and also I want the points hihi.