I completely agree with what Scott is saying. I just recently got a twitter and I also thought it was pointless. Posting things on twitter when no one is following you isn' t the greatest thing to do if your trying to create a PLN. I am sure that as time passes and you begin to follow people with the same interests as you, you can talk to them through twitter. I think twitter can be beneficial for high school students in order to help them create their PLN. There are so many people on twitter that could be interested in the same things as you and are willing to share their thoughts and ideas, you just have to put yourself out there in order to get it started.