Realistic photographs of Piano's in social places that illustrate the Piano's role in society.
Post photos that do all these things:
1) include a Piano
2) include the social context of the piano. e.g. , a shop, a bar, the beach, moving, burning, making, painting etc.
3) are unlikely to confuse or offend a 12 year old child or sensitive adult.
4) finally, write something complimentary on another person's Piano picture