While desired early experiences commonly seem to relate to pleasant sensational aspects of software and product use, prolonged experiences are significantly more tied to aspects that reflect how the product may become meaningful in the user's life. Social products are not solely responsible for mediating goal achievement; they fulfill an inner need for personal growth and communicating messages about the user's self-identity in a social setting. As a user's familiarity with a product strengthens over time, it is expected that they would experience less frustration, as well as less excitement. As a result, the perceived quality of the product is expected to change, and therefore the relative importance of different qualities in the product can also change over time. It is widely accepted that learnability and novelty are critical during initial phases of product use, however, other aspects such as a product's social capital are likely to motivate prolonged use.