Being in a long distance relationship myself, I know the ins and outs of the difficulties couples in this situation have to face; if only there was a solution to the small trials and hurdles that we have to face in a day-to-day situation.
Distance makes the heart grow fonder, true–however; the points that lead up to the strength people must have to support that growing heart is difficult to obtain. I would be interested in creating an app that makes leaving messages and gestures technically to show reassurance to the opposite partner giving them positive reinforcement to know that the partner is thinking of them and missing them.