In my opinion the best days for social network posting are Thursday and Monday and the Best time is Evening 5:30 - 6:00, noon 1:00 - 2:00 and morning 7:00 - 800.
Is there a logical reasoning behind the Monday and Thursday answers? Or was it meant to be tongue-in-cheek? My sarcasm meter is not working well at the moment
Best time to post is subjected to the country you post. For instance, you are in India and need to cover for US audience then you might post in the morning /evening time else you already have good followers then no need to restrict yourself with timezones.