Ask yourself this question. Where are you now?

Where will you be tomorrow?

Where will you be in a month?

Where will you be in a year?

Now as yourself where you will be if you made the choice to spend an hour a day on task X. Where will you be?

Repeat every time you decide to open a new browser tab. It is a very slippery slope every time you unconsciously go to youtube, forums, etc. The first step is to become conscious of the time sucking activities.