If you've a general idea, click on the title and leave that below also.

In general we communicate what passed

And printing me helped do so fast

To go to me means all will know

And off not cold, but hot will go

Though hold a minute, shocking all bottom to top

So us you stop.

'You communicate in the past?'
'Well naturally I did also, and shall continue to into the future.'
'Oh, that's a relief. Otherwise I'd be quite bored.'

Riddle Answer Press

Riddle Explanation
in general we communicate what passed - the communications media as a whole.

and printing me helped do so fast - a printing press.

to go to me means all will know - to go to press.

and off not cold, but hot will go - hot off the press.

though hold a minute, shocking all bottom to top so us you stop - stop the presses! Hold everything!