One who uses Social Media, such as
FB, Twitter, etc, to cause ill will, or otherwise "stir the pot" toward an issue, or a
person, with false information--allowing enough time to plant doubt, or end friendships...then quickly deleting his/her posts, in a series of
post-delete-repost sequences...designed to hurt a particular
person, and/or, their reputation.
This type of "Deletist" is both cowardly, and dangerous--loyal only to himself. Anyone that 'crosses him/her', will be subjected to his campaign of lies and deletions.
The Deletist will come out from under his rock only long enough to hurl lies about his perceived enemy, leaving the
post only long enough to gain
attention, then
delete, and run back under his rock....mocking the 'fools' that believe his lies.