To lighten the burden created by demonetization initiative, there is a Facebook group available where members can join and post about an ATM in their locality where cash is available/where they were able to withdraw. This will help others to find out in which ATMs cash is available, before they go there.
(It is a closed group, but if you are from Chennai you can apply to join. Do read the description of the group before joining.)
Members are requested to post info about functioning ATMs in the following format:
Date & Time:
Note: Since this is a volunteer-driven group, the accuracy of the information may not be guaranteed. Also, there is a chance that an ATM where money was available in the morning may not have money in the evening, etc. Members are requested not to spam.
I thought this is a good initiative and wanted to spread the word.