For those of you still searching for the 7 ghosts of Notice the Unnoticeable quest, I'd like to share the resources I've been using for my Ghost Walks, and point out some errors in them.
Glitch Remote lists 40 ghost streets but it misses the 5 in Poolokoo, and the 4 in Callopee. So, the total is 49 streets. Also, the Chakra Phool map highlights ghost streets, but one is wrong/misplaced. Instead of Dalsan Detach, it should be Iljoki Ease.
Glitch Strategy Wiki for ghosts lists 48 streets (with Ghost pictures!), including the ones on Poolokoo, but misses MitMit Meets. Thanks to Ghost Walker Misty Mountain for discovering this! A further problem with MitMit Meets is that the ghost heartbeat is there, but it does not appear, even if you have the Faded Heart. Look between the Beryl and Sparkly at upper right, top.
If you are new to ghost hunting, turn off the music and turn up the effects (headphone). If you hear a heartbeat, mouse over places above and between things. Some ghosts are obscured by trees! Look for faint fireflies, and the ghost appears when you point to it. Be aware you might not have a heartbeat sound, but keep looking!
Good luck and happy Glitching!
Edited to add Callopee. Thank you Kip Konner!
Update #2 - Ghost in Kloro, making total of 50 locations - See below.