A social media post is the only piece of media work where the audience decides in under a second whether to keep looking. That makes it a design problem, not a posting problem. The order that professionals work in is always the same: decide who you are talking to and what you want to happen, then choose the platform, then build the content to that platform's frame. Reversing that order — making something and then hunting for somewhere to put it — is why most student campaigns land flat.
Planning the campaign
- Name the audience precisely. Not 'students' but 'Grade 9 students who have not joined a club yet'. A vague audience produces vague content that speaks to nobody.
- State one measurable goal. Awareness, sign-ups, attendance, donations or clicks — pick one. A goal you cannot measure is a wish, and a campaign with three goals usually achieves none.
- Choose the platform from the audience, not from habit. Where does that specific audience already spend time, and what format does that place reward — short vertical video, still images, longer horizontal video, text?
- Define three to five content pillars. These are the recurring themes you will post about, so that you are never staring at a blank calendar wondering what to make.
- Set a cadence you can actually sustain. Three good posts a week beats fourteen rushed ones followed by silence. Consistency is what builds an audience; bursts do not.
- Build a content calendar. Date, pillar, format, caption, asset, and who is making it. This is the document that turns intentions into finished posts.
- Measure, then adjust. After a week or two the analytics tell you which pillar and which format the audience actually responded to. Feed that back into the calendar.
One audience, one goal, one call to action
Every element of a post should serve a single desired action, and the post should say what that action is. 'Come to the drop-in on Thursday at lunch in room 214' works. 'Check us out' does not, because it never tells the viewer what to do or when. If you cannot state the goal in one sentence, the design cannot serve it.
Content pillars and cadence
- A content pillar is a repeating category of post — for a robotics club it might be build progress, member spotlights, competition results, and how-to explainers. Pillars keep a feed varied without making every post a fresh invention.
- Batching means producing a week or a month of content in one session. Shooting eight member spotlights in one afternoon is far cheaper than eight separate shoots, and it is how small teams keep a schedule alive.
- A hook lives in the first second. On vertical video the first frame and the first spoken line decide whether anyone sees the rest. Put the most interesting image first, not a title card.
- Captions get truncated. Only the first line or two shows before the 'more' link, so front-load the important information and put context, credits and hashtags below.
- Hashtags are search terms, not decoration. A small number of specific, relevant tags outperforms a wall of generic ones, which mostly signals spam.
- Post when the audience is awake. For a school audience that usually means before class, at lunch, and in the evening — and you can confirm it from your own analytics rather than guessing.
| Aspect ratio | Typical pixels | Where it is used | Why |
|---|---|---|---|
| 1:1 square | 1080 × 1080 | Grid posts, profile tiles, carousels | Crops predictably everywhere and never rotates the phone |
| 4:5 portrait | 1080 × 1350 | Feed posts on phones | The tallest shape most feeds allow, so it fills more screen than a square |
| 9:16 vertical | 1080 × 1920 | Stories, reels, shorts | Fills a held phone completely, edge to edge |
| 16:9 landscape | 1920 × 1080 | Long-form video, desktop players, televisions | The standard video frame since HD; matches most cameras and screens |
The safe area is smaller than the frame
On a vertical 1080 by 1920 post, the interface covers roughly the top 250 pixels with the profile name and the bottom 400 or so with the caption, buttons and progress bar. Anything you place there — a logo, a date, the room number — is hidden behind the app's own controls. Keep every piece of text and every logo inside the central safe area, and treat the outer band as background only.
Reach, impressions and engagement
| Metric | What it counts | What it tells you |
|---|---|---|
| Impressions | Every time the post was displayed, including repeats to the same person | How much it was shown — inflated by people scrolling past twice |
| Reach | The number of unique accounts that saw it | How many actual people it got to. Always the smaller number |
| Engagements | Likes, comments, shares and saves added together | How many people did something instead of scrolling on |
| Engagement rate | Engagements as a percentage of reach | Quality of the post, comparable between a small account and a large one |
| Shares and saves | Reposts and bookmarks | The strongest signals — the viewer thought it was worth keeping or passing on |
| Watch time | Average seconds watched, or percentage of the video completed | Where viewers leave, which tells you exactly which second to fix |
| Click-through rate | Link clicks divided by impressions | Whether the call to action actually moved anyone |
Accessibility is part of the deliverable
- Alt text is a short written description of an image, read aloud by a screen reader. Describe what matters — 'four students soldering a circuit board at a workbench' — and skip 'image of', which the screen reader already announces. If the image contains words, the alt text must contain those words too.
- Captions carry the dialogue plus the sound information a viewer cannot hear: speaker changes, music, a door slamming. Subtitles assume you can hear and only carry the dialogue, usually translated. Social video needs captions, because most feeds start muted.
- Burned-in captions are part of the picture and always appear; a separate caption file can be turned off, searched and translated. Many creators do both.
- Contrast ratio compares the lightness of text against its background. The widely used standard is at least 4.5 to 1 for normal text and 3 to 1 for large or bold text; thin light-grey type over a photograph almost never passes.
- Never carry meaning by colour alone. Add a label, an icon or a pattern, so that a colour-blind viewer — roughly one man in twelve — gets the same information.
- Keep type large enough on a phone. Text that looks fine on a laptop preview can be unreadable at the size it is actually viewed, so check every design at phone scale before exporting.
- Avoid rapid flashing. More than three flashes in a second can trigger seizures, which is a safety issue rather than a style one.
Accessibility is reach
Captions are not only for viewers who are deaf or hard of hearing. Most social video is watched with the sound off, in a hallway or on a bus, so a captioned video is watched by people who would otherwise have scrolled past a silent talking head. Alt text is likewise indexed as text, so it helps the post be found. Doing the accessible thing and doing the effective thing turn out to be the same work.