What are X (Twitter) Posts?
X posts (still informally called tweets) are short-form text updates of up to 280 characters for free accounts and up to 25,000 characters for X Premium subscribers. They can include up to 4 images, video (up to 2 minutes 20 seconds for free, up to 3 hours for Premium), polls, and link previews. The format is famously fast-paced — the average lifespan of a tweet's reach is roughly 18 minutes — which means volume and consistency matter more than polish.
For US founders, indie hackers, journalists, consultants, and B2B marketers, X remains a high-leverage platform despite its turbulence post-2022. The audience is influential — disproportionately journalists, investors, founders, and decision-makers — and a single tweet that goes viral can produce demo requests, press coverage, or job offers within hours. The format also rewards thread structures: 5–15 connected tweets that read as long-form essays. Threads are the closest thing X has to evergreen content. publy.ch helps with both single-tweet copywriting and full thread structuring, plus branded image cards for posts that include visuals.
How to create X Posts with publy.ch
With publy.ch the workflow handles both single posts and threads:
- Choose post type — single tweet, thread, quote tweet hook, or image card.
- Describe the idea — one sentence on what you want to say. The AI generates 3 hook variants tuned for X's punchy voice.
- For threads, generate the full structure — the AI writes a thread outline with hook, 5–10 body tweets, and a CTA close.
- Add a branded image card — for engagement-bait tweets, generate a 1600 × 900 px graphic in your brand style.
- Schedule for peak hours — Tuesday–Thursday 8–10 a.m. ET works for most US B2B audiences.
You ship X content with the cadence the platform rewards, without spending hours per tweet.
Best Practices for X Posts
- Hook in the first line. Tweets and threads both live or die on the opening line. "I just realized…", "Here's a controversial take," "Most founders get this wrong."
- Threads outperform single tweets. A well-structured 7-tweet thread will reach 5–10× more people than a single tweet on the same topic.
- One idea per tweet. Don't cram. Each tweet in a thread should stand alone.
- Avoid external links in the main tweet. X de-prioritizes link tweets. Put links in a follow-up reply.
- Engage in the first 30 minutes. Reply to every reply. Engagement velocity is the strongest ranking signal on X.
- Use 0–2 hashtags max. Heavy hashtag use hurts on X.
- Image cards lift engagement on text tweets. A 1600 × 900 image with your headline and brand mark earns roughly 2× the engagement of a pure-text version.
- Post 3–5 times per day on X if growth is the goal. The half-life is short — volume compensates.
Formats and Dimensions
- Text: 280 characters (free) or 25,000 characters (Premium)
- Single image (in-stream): 1600 × 900 px (16:9) or 1080 × 1080 px (1:1)
- Multi-image: up to 4 images, 1080 × 1080 each
- Link preview card: 1200 × 628 px (1.91:1)
- Video: up to 1080p, MP4
- File size: images up to 5 MB; video up to 512 MB free / 8 GB Premium
Common Mistakes to Avoid
- Long-winded openings. "I wanted to share some thoughts about…" wastes the hook. Get straight to the point.
- Generic hashtag spam. #marketing #business #entrepreneur is noise.
- Sharing links in the main tweet. Suppresses reach. Reply-link is the trick.
- No personal voice. X rewards opinions and personality, not corporate speak.
- Inconsistent posting. One tweet a week doesn't compound. Daily presence matters.
Create X Posts with AI — Try publy.ch Free for 3 Days
With publy.ch you maintain a serious X presence without spending hours per day. AI hooks, thread structures, branded image cards. Start your 3-day free trial at publy.ch.