5. The method of claim 4 wherein enabling the second user to specify a first weighting to be applied to the interest profile of the first user and a second weighting to be applied to the interest profile of the second user comprises enabling the second user to manually select the first weighting and the second weighting through interaction with a graphical user interface.
7. The method of claim 5 , wherein enabling the second user to manually select the first weighting and the second weighting through interaction with a graphical user interface comprises enabling the second user to perceive, within the graphical user interface, a bar having a slider configured to be moved along the bar in response to user manipulation, wherein the slider being moved to a first position on the bar that is located between a first and a second terminal end of the bar corresponds to selecting the first weighting and the second weighting for combining the interest profile of the first user and the interest profile of the second user; wherein the slider being moved to the first terminal end of the bar corresponds to selecting weightings such that the interest profile of the second user is used to inform search results and the interest profile of the first user is not used to inform search results, and wherein the slider being moved to the second terminal end of the bar corresponds to selecting weightings such that the interest profile of the first user is used to inform search results and the interest profile of the second user is not used to inform search results.