Stay focused at work or doing deep work is a problem for most of us in the world of the internet, social media, and online communications. 
There are a lot of good chances to get so distracted and spend most of our useful time to have online interactions.

 As I had also the similar problem, I tried to find a good feasible solution for having more focus on my tasks with less distraction.

These are the ways which helped me a lot in this area:

1. Answering all my emails and messages just at the beginning of the day.2. Defining the most important tasks of the day before I start working on them
3. Putting my phone in my bag or somewhere out of reach, but not on my desk  
4. Closing all social media and messenger apps on my laptop

I use this method as 30 min-5 min. That means, I focus on my tasks for 30 min and then have 5 min break for taking a rest or maybe checking my social media.
Having an excel sheet to record these steps daily and trying to improve my focus period has helped me also to track my progress.