4 ms·

There are startups in this space, but there are also people who value the friction (and not all for selfish reasons).

• bubblethink 7y ago
  > (and not all for selfish reasons) Can you elaborate?
  • ska 7y ago
    Having physical interaction and time needed makes it harder to file nuisance suits, etc.
  • sporkland 7y ago
    Physical version of proof of work. It helps avoid spam by making it costlier.