IANAL, but I somehow doubt that's how pardons work.
EDIT: What I specifically doubt is that Trump can just write out a pardon for "anyone on Parler". Doesn't it have to be a pardon for someone specific? Or can it be as generic and vague as he wants?
EDIT: What I specifically doubt is that Trump can just write out a pardon for "anyone on Parler". Doesn't it have to be a pardon for someone specific? Or can it be as generic and vague as he wants?
President Carter pardons draft dodgers
On January 21, 1977, U.S. President Jimmy Carter grants an unconditional pardon to hundreds of thousands of men who evaded the draft during the Vietnam War.
In total, some 100,000 young Americans went abroad in the late 1960s and early 70s to avoid serving in the war. Ninety percent went to Canada, where after some initial controversy they were eventually welcomed as immigrants. Still others hid inside the United States. In addition to those who avoided the draft, a relatively small number–about 1,000–of deserters from the U.S. armed forces also headed to Canada. While the Canadian government technically reserved the right to prosecute deserters, in practice they left them alone, even instructing border guards not to ask too many questions.
<https://www.history.com/this-day-in-history/president-carter...>
(Not an endorsement of a mass pardon of all Parler members.)
But the Carter case does address the circumstance of pardoning a large (and arguably unknowably large) class.
Carter pardoned anyone/everyone who dodged the draft during the Vietnam War https://en.wikipedia.org/wiki/Proclamation_4483
https://www.youtube.com/watch?v=JNZc9H54eBI https://www.youtube.com/watch?v=Mx4FD6xtLJM https://www.youtube.com/watch?v=QMiOMNIRs3k
TLDR: He can pardon any federal offense.