# A social media style guide: the rules behind every post

> A social media style guide is a short rulebook for the daily decisions that templates and brand guidelines do not cover: what each channel is for, how you sound in a caption and in a reply, how images, logos, hashtags and emoji are used, who answers comments and who approves what. Keep it to two to four pages, with examples, and review it every quarter.

By LAIN, 8 Feb 2026. 6 min read. Category: Social media. Canonical: https://lainagency.com/resources/social-media-brand-style-guide

A social media style guide is the rulebook for how your brand looks and sounds in feeds, comments and messages. It is shorter and more practical than your [brand guidelines](https://lainagency.com/resources/brand-guidelines-what-to-include), and it answers questions that no template can: how a caption opens, which hashtags you use, how you reply to a complaint and who signs off a post. Aim for two to four pages that anyone posting for you can follow without asking.

## What a style guide covers that templates do not
Your [templates](https://lainagency.com/resources/social-media-templates-brand-consistency) fix the layouts. Your brand guidelines fix the logo, colour and typefaces. The social style guide sits between them and covers the choices that come up every week:

- What is each channel for, and who owns it?
- What do we sound like in a caption, and in a reply?
- How are photographs, graphics and the logo used?
- Which hashtags and emoji, and how many?
- Who replies, how fast, and when do we escalate?
- Who approves what?

If a rule never comes up in a real post, leave it out. A guide nobody finishes reading does not get used.

## Name the channels and their jobs
Start with one line per channel. Each channel needs a job, a kind of content and one named owner.

| Channel | Job | Typical content | Owner |
|---|---|---|---|
| Instagram | Show the work and the people | Carousels, Reels, stories | Social lead |
| LinkedIn | Explain how you think to buyers | Short essays, projects, news | Founder or marketing |
| Email or website | Hold the full story | Articles, case studies | Marketing |

A channel without an owner is a channel that goes quiet. Calendar planning guides give the same advice: only list platforms that have an owner and a posting rhythm you can keep.

## Write the voice down with examples
Adjectives alone do not help. "Friendly and professional" describes almost everyone. Pick three to five tone words, as style guide advice usually suggests, and put each next to a "say this, not that" pair.

| Tone word | Say this | Not this |
|---|---|---|
| Direct | We reply within one working day. | We will try our best to reply as soon as we can. |
| Plain | The new range is in stock. | We are thrilled to announce an exciting launch. |
| Warm | Thanks for the kind words, Ana. | Your feedback is appreciated. |

Add one note on replies. Comments and messages are shorter and more personal than posts, and the person on the other end is a real customer. Say what you would say face to face.

## Set the visual rules for social
Keep these specific to feeds, not to the brand in general:

1. **Image treatment.** One rule that ties different pictures together, such as a consistent crop, colour grade or frame. Say which photographs are allowed and which are not.
2. **Logo.** Keep a full version, an alternate and an icon, and say which goes where. On a feed the logo can be small, because the system does the recognising.
3. **Text on images.** Keep it large enough to read on a phone, and give it enough contrast. The web standard WCAG asks for at least 4.5:1 for normal text.
4. **Margins.** Platforms crop and overlay buttons. Keep key content away from the edges and away from the top and bottom of vertical formats.
5. **Accessibility.** Write alt text where the platform allows it, put the key message in the caption as well, and caption video. Accessibility guides report that Instagram does not let you add alt text to Stories, so the caption and on-screen text carry the meaning there.

![A feed grid with a rules sheet beside it: one crop, two background colours, logo bottom left, text inside the margin.](https://lainagency.com/images/blog-art/social-media-brand-style-guide-fig.webp)

## Captions, hashtags and emoji
**Caption structure.** Decide how a caption opens, where the call to action goes and how it ends. Put the point in the first line, because only the start is visible before the "more" cut. Show one good and one weak example, since abstract rules get read loosely.

**Hashtags.** Write down how many, which ones and where they go. Keep to a short approved list that is relevant to the post. Capitalise each word of a multi-word hashtag: #GoRedRaiders is read aloud as three words, while #goredraiders is often read as nonsense. LinkedIn's suggested hashtags often appear in lowercase, so someone has to fix them by hand.

**Emoji.** Decide whether you use them. If you do, set a limit and a short list. One sample style guide caps them at two per post, which is a useful example of how specific a rule can be.

**Links.** Say where links live: in the caption, in the bio or in a pinned comment, and how they are tracked.

## Replies, comments and hard moments
This is the part most guides skip, and the one that matters when something goes wrong.

- **Who replies**, and how quickly. A target such as "within one working day" is a good start.
- **What you never do in public:** argue, share customer details or promise what you cannot deliver.
- **When to move a conversation** to a direct message or email.
- **Escalation.** Name the person to tell when a comment mentions safety, legal action, the press or a serious complaint, and say not to reply until they have answered.
- **Hiding and deleting.** Write down what counts as abuse or spam and what does not. Criticism is not abuse.

## Approval and ownership
Keep the process light. Routine posts made from approved templates need no sign-off. New campaigns, anything about prices or claims, and replies to public criticism need one named approver. Use the same statuses everywhere: draft, review, approved, scheduled, published. Our [content calendar guide](https://lainagency.com/resources/social-media-content-calendar) shows where those statuses live.

## Keep it short, then keep it alive
- Two to four pages, with real examples instead of long explanations.
- One place everyone can find it, and the date of the last review on the first page.
- A review every quarter, or after a rebrand or a new channel.
- Examples of five posts that are exactly right, linked from the guide.

We write social style guides as part of [social media design](https://lainagency.com/about#social-media-design) and branding projects. You can see how a brand carries one system across stories, posts and slides in [Outverge](https://lainagency.com/works/outverge) and [Montreval](https://lainagency.com/works/montreval). If your feed changes character every time someone new posts, [start a project](https://lainagency.com/contact) and we will set the rules down with you.

## Frequently asked questions

### What is a social media style guide?

A social media style guide is a short document that sets the rules for how a brand appears on social channels: what each channel is for, the voice, image and logo rules, captions, hashtags, emoji, replies and approval. It is narrower and more practical than full brand guidelines.

### How long should a social media style guide be?

Two to four pages is enough for most brands. Use examples instead of long explanations, and leave out any rule that never comes up in a real post. A short guide is far more likely to be read and followed.

### What is the difference between brand guidelines and a social media style guide?

Brand guidelines define the logo, colours, typefaces and overall voice for everything the brand does. A social media style guide applies them to feeds and conversations, and adds rules that only exist there, such as caption structure, hashtags, emoji, reply times and approval.

### Should hashtags be written in lowercase or with capitals?

Capitalise the first letter of each word in a multi-word hashtag. Accessibility guides recommend it because screen readers read #GoRedRaiders as separate words, while an all-lowercase hashtag is often read as one long word.

### How often should a social media style guide be updated?

Review it every quarter, and again after a rebrand, a new channel or a change in who posts. Put the date of the last review on the first page so people know it is current.

## Sources and fact check

Checked on 28 Oct 2026.

- [Buffer: Social media style guide](https://buffer.com/library/social-media-style-guide/)
- [SocialKit: Brand style guide for social media](https://socialk.it/en/blog/brand-style-guide-for-social-media)
- [Texas Tech University: Social media accessibility (hashtags, alt text)](https://www.ttu.edu/accessibility/digital-accessibility/docs/social-media-a11y.html)
- [W3C: Web Content Accessibility Guidelines (WCAG) 2.2](https://www.w3.org/TR/WCAG22/)