How do you contribute to your network?

File:10 Öre provmynt i guld ca 1882.jpg
Image from Wikimedia Commons (public domain).

This blog post is part of my course Social Media Strategist at Social Media Academy which I previously blogged about here.

When I look at the contacts that I have and care about what they do with their social presence I see that they are more active and contributes with more value, not just to me, but to many people. Perhaps that is why I at first found them being interesting, that they really are social and friendly even though they interact with people they might not have ever met before or even never going to meet. Wat do they they do? well, obviously they pass on interesting things and answers questions, but the things that really make some people shine is that they actively are finding the interesting conversations and chip in with their 2 cents although they have not been asked to.

This clearly speaks for that they have some sort of scanning and search methodology that is powerful, it seeems improbable that they just randomly finds places where they can and are willing to help. But it is not clear on how they are doing it, so my question to you who reads this is:
How do you do to be so effective in contributing with value to your network?