What motivates you to share? Share what? Share anything.
I'll tell you a few things that motivate me:
1. I want to invest in people who are in my life.
2. I feel a need to impress others.
3. I know something that others need to be successful.
4. I want to sharpen my own ideas.
I think that our purpose in sharing says alot about us and about the quality of what we share. Are we sharing to impress others? Are we sharing because we genuinly care for people? Are we sharing because we value others opinions? Are we sharing because we don't like silence?
Why are you sharing?