Is it safe to use social media over 4 hours per day?

Probably: Unlikely to do any harm directly. However indirect harms if it is meaning you're not getting enough exercise, not sleeping well or if it is causing stress, anxiety or impacting your relationships.

Possible: Depends on when we are using our electronic gadgets and where . using cell phone/tablets /i pad for whatever reasons in bed and closer to sleep time can affect the sleep cycle .

Unhealthy: It is unhealthy practice as it detaches you from the real world if interaction and developing relationship with real people to a world where you only learn to form friendships through online portals. 4 hrs is a great chunk of your day hiding behind an online portal. It can be psychologically reclusive and associated with higher rates of depression, anxiety and social phobia

Would not recommend: Likely too much screen time, go outdoors and exercise. If your job requires you to be on a computer it would be quite over the top

Screen time.: depend on how much screen time you do as a pat of your daily work. Also every thing in moderation is fine. 4 hours seems a bit excessive screen time.