Why does copy-pasting the same post to every network perform badly?

Because the limits and conventions genuinely differ — X caps at 280 characters against YouTube's 5,000, Reddit has no hashtags at all, and LinkedIn and X both suppress reach when a link sits in the body. Text written for one network visibly was not written for the other, and the algorithms demote it.

Which cross-posts are impossible without adding media?

Any pair going into TikTok or YouTube, which are video-only, and into Instagram, which requires a photo or video. A text-only post has nowhere to land on those three.

What breaks when you cross-post, network by network

Cross-posting fails for boring, specific reasons: a caption that fits one network is truncated on another, hashtag conventions clash, a link that is fine in one body suppresses reach in another, and three of these networks refuse text-only posts outright. Pick a pair to see exactly what changes.

Every limit here mirrors what PostWire enforces at publish time, not a guess.

The networks

Network	Characters	Media	Hashtags	Approval
Reddit	10,000	optional	none — Reddit has no hashtags	yes
YouTube	5,000	a video (required)	3-5 hashtags in the description, never more than 15 total	yes
Telegram	4,000	optional	not needed	no
LinkedIn	3,000	optional	3 hashtags (5 max) at the end	yes
TikTok	2,200	a video (required)	max 5 hashtags, inside the caption (comments are invisible to the algorithm)	yes
Instagram	2,200	a photo or video (required)	max 5 hashtags at the END of the caption	yes
Facebook	2,000	optional	1-3 hashtags	yes
Discord	2,000	optional	not needed	no
Mastodon	500	optional	2-4 hashtags in CamelCase (#SocialMedia, not #socialmedia) for screen readers	no
Bluesky	300	optional	1-2 specific hashtags	no
X	280	optional	1-2 hashtags, zero is fine	yes

Every combination

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Questions people actually ask

Why does copy-pasting the same post to every network perform badly?: Because the limits and conventions genuinely differ — X caps at 280 characters against YouTube's 5,000, Reddit has no hashtags at all, and LinkedIn and X both suppress reach when a link sits in the body. Text written for one network visibly was not written for the other, and the algorithms demote it.
Which cross-posts are impossible without adding media?: Any pair going into TikTok or YouTube, which are video-only, and into Instagram, which requires a photo or video. A text-only post has nowhere to land on those three.

The networks

Every combination

From Bluesky

From Discord

From Facebook

From Instagram

From LinkedIn

From Mastodon

From Reddit

From Telegram

From TikTok

From X

From YouTube

Publish native versions in one call

Questions people actually ask