The essentials
- The principle: the brand's voice does not change (values, vocabulary, what you never say); the tone adapts to the audience and to the codes of each network.
- LinkedIn: expert and direct, in the first person for the director, 800 to 1,500 characters, with few or no hashtags.
- Instagram and TikTok: close, visual, fast-paced, informal address possible, subtitles and a hook in one second.
- Facebook and the Google listing: warm and local, practical information, quick replies.
Posting the same text everywhere is the leading cause of posts that work nowhere: too long for Instagram, too light for LinkedIn, too corporate for TikTok. The answer is not to have six personalities, but a single voice expressed in several tones. This article defines the difference, describes the codes of each platform in 2026 and works through one example across networks. It complements scheduling your posts effectively.
Voice and tone: the distinction that prevents drift
- The voice is stable: what the company is, its values, its vocabulary (the words it uses and those it bans), its level of language, its position (accessible expert, passionate craftsperson, relaxed brand). It is set out in a one-page editorial charter.
- The tone varies: more formal or closer, longer or shorter, funnier or more factual, depending on the audience, the network, the topic and the moment. The same expert does not speak the same way at a conference and by the coffee machine; it is still the same person.
Without a defined voice, adapting per network produces inconsistency; without adaptation, the voice does not carry. The editorial brief that sets the voice is described in the SMO brief.
The codes of each platform in 2026
| Network | Audience and expectation | Register | Length and form | Hashtags and emojis |
|---|---|---|---|---|
| Professionals, decision-makers; expect expertise and opinions | Expert, direct, first person for the director, implicitly formal | 800 to 1,500 characters, short sentences, a line break per idea, a hook on the first line | 0 to 3 hashtags, emojis rare | |
| General public and visual professionals; expect inspiration and behind the scenes | Close, positive, informal address possible depending on the brand | Caption of 150 to 400 characters, the key point before the “more”, a visual that speaks for itself | 3 to 5 targeted hashtags, emojis in moderation | |
| TikTok | Young but increasingly broad; expects pace and authenticity | Spontaneous, to camera, humour possible, informal | Video of 15 to 45 s, hook in 1 s, subtitles, short caption | 3 to 5 hashtags, trends |
| Local, family, communities; expects practical information and closeness | Warm, concrete, formal or informal depending on the clientele | 200 to 500 characters, photos of people and places, events | Hashtags pointless, emojis in moderation | |
| X | News, tech, media; expects responsiveness and concision | Sharp, factual, a clear-cut opinion | Under 280 characters or a structured thread | 1 to 2 hashtags |
| YouTube | Looking for tutorials and explanations | Educational, structured | Descriptive title, detailed description, chapters | Keywords in the description |
| The Google Business Profile listing | Local customers actively searching | Practical, factual, welcoming | 100 to 300 characters, one piece of information per post, an action button | No hashtags |
One example adapted across networks
The topic: an SME in energy renovation publishes a guide on the 2026 grants for heat pumps.
| Network | Version |
|---|---|
| LinkedIn (director) | “In 2026, an air-to-water heat pump costs €12,000 installed on average. With the national renovation grant and the energy saving certificates, a middle-income household finances 40% of it. Three mistakes I see every week in applications: [list]. The detail is in our guide, in the comments.” |
| Instagram (carousel) | Page 1: “Heat pump in 2026: how much is left for you to pay?”; pages 2 to 6: one figure per page; page 7: “Full guide, link in bio”. |
| TikTok (30 s video) | To camera on a site: “Been told a heat pump is far too expensive? Look at what this customer actually paid.” Subtitles, figures on screen. |
| “Live in [town] and your boiler is on its last legs? The 2026 grants cover up to 40% of a heat pump. We explain it all, and we answer your questions in the comments.” Photo of the team on a local site. | |
| Google listing | “2026 heat pump grants: up to 40% funded for middle-income households. Free quote in [town].” “Request a quote” button. |
The voice is the same everywhere: precise figures, explanation, fieldwork. The tone changes: opinion and structure on LinkedIn, promise and visual on Instagram, spontaneity on TikTok, closeness on Facebook, practical information on the listing.
Common mistakes of tone
- The press release on Instagram: long text, corporate vocabulary, not a person in sight.
- The joke on LinkedIn with no link to your expertise: it gets liked, it does not convert.
- Informal address imposed on a clientele that does not expect it (regulated professions, older customers).
- Instagram hashtags copied onto LinkedIn and Facebook, where they have no effect and signal automation.
- A promotional tone on the Google listing in every post: people are looking for information, not an advert.
- Inconsistency between the account and the service: a warm tone online and curt replies to comments; replies are part of the tone; see community management.
Setting and controlling the tone
Write a one-page charter: the voice (three adjectives, ten words to use, ten words to ban, formal or informal address per network), then a table per platform with register, length, hashtags and one example. Reread each post against the line set for its network. Then measure per network: engagement rate, comments (their tone says a lot about yours), clicks; the metrics are in the SMO KPIs. A tone that fits shows in the quality of the comments more than in their number.
How GreenRed helps
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Frequently asked questions
Should you use formal or informal address on social media?
It depends on your clientele and on the network, not on fashion. Formal address remains the norm on LinkedIn, Facebook and the Google listing for a services SME; informal address is common on Instagram and TikTok for consumer brands. Choose per network, note it in the charter, and do not change from one post to the next.
Can you use humour in professional communication?
Yes, if it is consistent with the voice and suited to the network: self-deprecation and situations from the field work on TikTok, Instagram and Facebook; on LinkedIn, humour serves as a hook and then gives way to a point of view. Avoid humour on topics that are sensitive for your clientele and on the Google listing.
How many hashtags should you use per network?
In 2026: 3 to 5 targeted hashtags on Instagram and TikTok, 0 to 3 on LinkedIn, none on Facebook or the Google listing, 1 to 2 on X. Lists of 30 hashtags no longer improve reach and signal automation.
Should the director post in the same tone as the company page?
The same voice, a more personal tone: first person, opinions, experiences, behind the scenes. On LinkedIn, the director's profile carries several times further than the page; it gains from being more direct and more personal, while respecting the vocabulary and the values in the charter.