Reply guy
Social media phenomenon: users (statistically often men) who reply unprompted to popular posts from strangers (statistically often women) — unwanted advice, "well actually", compliments. Tongue-in-cheek term, but describes a real pattern.
Twitter quote-tweeted often for dunks; reply guys are more DM-like parasocial projection in a public channel. Platform features to limit it: Twitter "Who can reply" (1-3 tiers), Bluesky similar, Mastodon visibility mode "Followers only". The block button became more aggressive over time (X 2023 changed block semantics). Mute function: blocks without notifying. Anti-stalk: a secondary account to read a public thread without appearing in replies.