[base]

That's what most big e-commerce websites already do. From the moment you have a login the content is personalised to you.

[sdflhasjd]

Ah yes, I see you bought a mattress. May I recommend these other mattresses to add to your collection?

[ecshafer]

Its weird that no one has cracked: you bought a mattress recently, would you like to buy these bed sets or bed frames? Complementary goods are not exactly rocket science. If I go to a a dealer and buy a car they try and upsell me on features on the car, they don't try and sell me another car.

[stevewodil]

This guy must really love mattresses!

[kwertyoowiyop]

Maybe we can get him to subscribe to mattresses!