Every thing that you do is going to leave you with either energy gain or loss. The idea is to either sustain energy level or spend what you have then gain it - just like charging a battery.
Tricky part is doing things that give you energy gain. One thing might be very exhausting in the evening, but give you a lot of energy in the morning. It achanges with setting and context as well (for example after 10 days of constant socializing you might want to be left in solitude for a few days, or after spending week in solitude you might crave for social interaction).
So, a lot of things you’re seeing online are people for which professional socializing is an energy gain. After full day of work (or even during work break) they get an energy boost from sharing, answering and attending conferences.
This isn’t for everyone - though. It might be that for you doing stuff like this is actually energy loss. If you’re expending your energy throughout the day and at the end you need to spend bit more to write a blog post or prepare for the conference you are going to subconsciously push it away from you making an illusion of “not getting enough time of doing it”.
In concrete scenario imagine situation where a person has exactly 10 minutes (of non-allocated) time (let’s say wait for doctor appoinment). One person is going to open a game on their phone, other is going to browse the news, someone else is going to open a laptop and write 5-6 lines of code for the stuff they are building and other is going to browse stackoverflow. Such timeslot isn’t usually planned, but it builds the result from small blocks and (usually) is following "energy gain" or at least not a energy gain.
(Note: even if for someone doing social stuff is constant energy loss there is no reason to fret. It’s not really a requierement: while you aren’t going to be internet famous you can still earn a very decent living without having to take part in professional/non-professional social networks).