[grackle]

Indeed. The key here is recognizing that the "model" approach is fundamentally different than the "superset" approach. Too often these get blended together.

Portraying your idea as the sum of several individual models can be a very effective technique. Saying something like "you can send your friends fake gifts, just like you can on Facebook" and "you have a live chat window like JustinTV" is more likely to promote understanding and less likely to raise questions than saying "Imagine if Facebook was better..."

(Yesterday, I actually saw a presenter get grilled for 20 minutes about features completely unrelated to their program, due largely to the fact that they took this "Imagine If.." approach.)