How to write hooks that earn the second sentence

Most Instagram hooks fail because they spend the first line on context instead of tension. On the feed, only the first 125 characters of a caption show before the 'more' cutoff, so a line that opens with a windup ('So I've been thinking lately about...') burns that visible space before any reason to keep reading appears. Hooks that earn the second sentence front-load a specific stakes, a curiosity gap, or a concrete number ('I lost 4,000 followers in one week'). They also avoid generic openers that the brain has learned to skip. A strong first line creates an open loop the reader needs closed, names a specific person or problem, and fits inside that 125-character preview window so the payoff is visible the moment someone stops scrolling.

A LinkedIn hook and a TikTok hook target different attention mechanics. LinkedIn truncates posts at roughly the first 2-3 lines (about 140-210 characters on desktop) behind a 'see more' link, so the hook is read silently and must promise a professional payoff, often a contrarian claim or a specific outcome. TikTok hooks are spoken or shown as on-screen text in the first 1-3 seconds, competing against an instant swipe, so they front-load motion, a bold visual statement, or a question the viewer answers in their head. LinkedIn rewards a single sharp line plus a deliberate line break before the fold; TikTok rewards a hook that pairs verbal and visual tension immediately. Same goal, second-sentence pull, but one is read and one is watched.

A few hook structures travel well across platforms because they exploit attention rather than a single feed layout. The curiosity gap names an outcome but withholds the how ('This one edit doubled my reach'). The pattern interrupt opens with an unexpected admission or contrarian take ('Stop posting daily'). The specific-number hook trades vague claims for hard figures ('3 words killed my email open rate'). The named-stakes hook calls out exactly who should care ('If you've ever deleted a post out of fear, read this'). Each works because it opens a loop the reader must close. The reliable test is the same everywhere: does the first sentence make the second sentence feel mandatory? If the opener could be deleted without loss, it isn't a hook yet.

LinkedIn's post box is plain text, so there's no toolbar — the workaround the whole creator economy uses is Unicode bold. Type your line, convert it to bold Unicode, then paste it into your post, comment, headline or About section and the emphasis sticks. Bold just the hook — the part that shows before the “…see more” cut-off — to earn the click. Keep the rest plain so the post stays skimmable and accessible.

Instagram collapses the returns you type in the native composer, which is why captions come out as one block. The reliable fix is to add the breaks with a tool that inserts real spacing rather than invisible-character hacks (which can break search and accessibility). Write the caption with the breaks you want, generate it, and paste the result. Put your hook on line one, since that's the part that shows before 'more'.

WhatsApp is the exception — it has its own built-in markdown: wrap text in *asterisks* for bold, _underscores_ for italic, and ~tildes~ for strikethrough. You usually don't need Unicode there. Use a WhatsApp formatter when you want a style WhatsApp's markdown doesn't cover (like small caps or script for a status), or when you're writing once and posting the same text across several apps that don't share WhatsApp's syntax.