One of the ways to capture attention is to be scattered around in many places, buying your attention small and wide-spread. It's a pain in the neck to have accounts over many networks, but if you use each one strategically, you can dramatically improve your visibility. The challenge is tying them all together. 

Blog: Paying attention to the attention economy, 2011-Jul-5, by Seth Godin

Attention is a bit like real estate, in that they're not making any more of it. Unlike real estate, though, it keeps going up in value.