Other posters have already demolished the original post so I will refrain from commenting on it directly, but I will say the following:

The main value I get from paper sticky notes is that I stick them to my monitor, and they become a blatant physical reminder to attend whatever is written on the note. And if you ignore things for too long you eventually start losing screen real estate.

Digital sticky notes are useless - a half-baked imitation of both paper notes and real issue tracking systems.