iOS messaging and other apps (i.e. skype) only show message timestamps periodically, versus the older method of showing a timestamp for every message.
(The new method offers the ability to swipe left to see all timestamps.)
Contrast this new behavior with WhatsApp behavior, which shows a day stamp for all messages in a given day, and then embeds the time of the message within the chat bubble.
So the question is, without the ability to swipe left, what makes a better UX for a social networking chat app (average user, not power user):
a) the new iOS method WITHOUT swipe-left (datestamp periodically)
b) the old iOS method (datetime stamp on every message)?
c) the WhatsApp method
Also..what is the generally accepted time lapse in the new iOS method before a new datetimestamp is placed?