For me one of the biggest problems in this regard is actually hacker news. I feel I get allot of value out of it but also waste way too much time. So I've been working on something that is intended to send me a daily summary of the top articles in categories that interest me. The idea is that I won't be able to click on other articles that are less relevant to my professional life and save time because I get a short summary on addition to the link. Also won't be able to read comments for a long time. Would other be interested in that as well and would you be willing to pay for something like that?