The temptation is obvious: the text is written once, there are three channels, publish everywhere. It works worse than it looks, for reasons that are not immediately visible.
Overlapping audiences
If the channels are close in topic, some people follow both. They see the same post twice within a minute and unfollow the one they consider secondary. On measuring that — audience overlap.
When several channels make sense
- Different niches. Then the text should differ too: one phrasing rarely suits two audiences.
- Different languages. Here duplication is exactly right.
- Different formats. A main channel with analysis and a short news one are two products.
Separating by time
Do not publish simultaneously. A couple of hours apart removes the duplicate effect for people following both and gives a second chance at a good slot.
Rights and accounts
Each channel needs admin rights for the working account. One account across five channels is fine; the same account across fifty is noticeable behaviour. And rights must be checked per channel: losing them in one is invisible from another.
What to measure
Compare reach as a share of each channel's subscribers rather than in absolute numbers. Otherwise the big channel always looks better simply for being big.
How Neurogram does this
Everything above is manual work that runs into the number of hours in a day. Neurogram does it on your own accounts and without you: it collects channels and audiences, writes comments and replies with a language model, and keeps limits and quiet hours so the accounts survive. See pricing or look at your case.