This is what they were doing, even BEFORE crunch time, two weeks ago:
AZ (11 EV) : @realDonaldTrump, @LaraLeaTrump
ME ( 4 EV) : @VP
MI (16 EV) : @EricTrump, @IvankaTrump
NC (15 EV) : @realDonaldTrump, @IvankaTrump, @DonaldTrumpJr
NH ( 4 EV) : @VP, @EricTrump
NV ( 6 EV) : @LaraLeaTrump
OH (18 EV) : @VP
PA (20 EV) : @realDonaldTrump, @VP, @DonaldTrumpJr
WI (10 EV) : @IvankaTrump
9 states, 104 EV involved.
I admittedly have no idea what the impact of campaigning really is. I only know that Trump gets big crowds wherever he goes which probably creates buzz and maybe some media. What impact that has on turnout (which is ultimately what matters) i don’t know and haven’t read anything useful on the subject