I use LinkedIn to market towards the people that are looking for work from home or want a different career all together.
I use Twitter to market people that want to buy or sell their items at TripleClicks.
I also use Twitter for having people that want to join SFI too.
I use FaceBook for both marketing for TripleClicks and Joining SFI and starting a new career with SFI, and buying and selling your items at the TripleClicks store.