Hi, I can relate to you. My son is 15 years old and every time I checked him if he is doing his homework, he will change the screen of his laptop. Nowadays a world is filled with distractions everywhere we turn. I told my son to focus on his homework, no texting or browsing Instagram, snap chat, twitter. Sometimes I would check him from time to time to make sure he is doing his homework or else he will stay up until 2 am doing homework. I learned a lot from this article,
http://bit.ly/2oMnUmV, it teaches about how to set limits in what and how long they can view social media, it might help you too.
In order for you to figure out what your son is looking at the internet, you can try this link,
http://bit.ly/2p9q9NM. Thank you for sharing.