Quick Easter Run
Answers
Every major city have a twitter feed like this. NYC have a few feeds like this but NYC is so large you may be in Brooklyn and they tweet a pokemon with good IVs in the Bronx there is no way to get there within the spawn window. Even if you are in the Finical District and they Tweet one in Central Park the commute time will be greater than the spawn timer.
The issue is that it relies on user input now. Most of these feeds are now inactive because they used bots that find and automatically tweet out the locations but Niantic shut those down.
As an NYC player you are better camping out in Central Park around Bethesda Statue, Bryant Park on the 6th avenue side or Prospect Park.by the Picnic House
The problem is, that A, B and C compete for the same gyms.
Yes, there is walking, skating and motor biking. There are challenges. But there is no challenge with walkers, skaters and motor bikers competing against each others.
So, if the rule says, only walking is allowed, skaters and motor bikers are disqualified.