What Counts as "Serving Others"?

I agree that helping people, doing things for others, is the key to living a good life. But who gets to decide what is counted as serving others? Most people will automatically think first of the heavy lifting, purely physical things, like volunteering their labor at charities. They then might consider simpler deeds, like giving someone a ride. What about if one is not physically able to help others in such a way? What if their way of helping is less obvious, indirected even? 

Picture someone on their computer at home writing a blog about their health experiences in hope someone else who needs guidance will find the page. They choose to devote the time to do it because they want to make another life better by sharing what they've learned. They are indeed serving others, despite it is not the outwardly way we expect. 

Never assume others are selfish because you don't see them volunteering. They might be helping other people in their own way, the only way they can; and they may just be of the few who can help in this way. It is not up to any one of us to determine what classifies as serving the fellow man. Do what you yourself can without judging you are doing something greater than another, for the point of serving others is to help someone, not to compete in who helps more. Believing you serve others more adequately than another person does would be the selfish act committed here.