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Content & social glossary

Plain-English definitions of the LinkedIn, Substack and AI-search terms that actually matter — 15 terms, one page each. Every entry opens with a single-sentence answer, then explains the mechanism behind it.

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Built and maintained by , founder of Liftli · last reviewed July 2026

AI OverviewAn AI Overview is the AI-generated summary Google places above traditional search results, which answers a query directly in a few sentences and links out to a handful of cited sources instead of ranking ten blue links. Building in publicBuilding in public is the practice of sharing a product or company's real progress openly as it happens — including revenue numbers, failed experiments, and unresolved problems — rather than announcing only finished, polished outcomes. Carousel postA carousel post is a multi-page document or image set — usually a PDF uploaded to LinkedIn — that readers swipe through slide by slide, turning one post into several screens of content inside the feed. Dwell timeDwell time is the number of seconds a reader spends on a single post before scrolling away, and it is one of the strongest quality signals social platforms use to decide whether to show that post to more people. Engagement podAn engagement pod is a private group whose members agree to like and comment on each other's social media posts on a reciprocal schedule, in order to manufacture early engagement signals that platform ranking systems interpret as genuine interest. GEO (generative engine optimization)GEO (generative engine optimization) is the practice of shaping content so AI answer engines like ChatGPT, Claude, Google AI Overviews and Perplexity cite it when they generate answers, rather than optimizing for a ranked list of blue links. GhostwritingGhostwriting is the practice of paying a writer to produce content that gets published under someone else's name, so the credited author keeps the byline, the audience, and the authority while the writer stays invisible. HookA hook is the opening line or two of a social media post — the only portion visible in the feed before a reader taps "see more" — whose single job is to earn that tap. ImpressionsImpressions are the total number of times a piece of content was displayed on screen, counting every view including repeat views by the same person, which makes impressions always equal to or greater than reach. LinkedIn algorithmThe LinkedIn algorithm is the ranking system that decides which posts appear in each member's feed, scoring content by early engagement, dwell time, relevance to the viewer's network and interests, and signals that flag spam or low-quality bait. ReachReach is the number of unique people who saw a piece of content at least once, counting each person a single time no matter how often they viewed it, which makes reach always equal to or lower than impressions. Reply guyA reply guy is someone who builds an audience primarily by replying to other people's posts rather than by publishing their own, borrowing the attention already gathered around larger accounts to get in front of their readers. Social sellingSocial selling is the practice of using social platforms like LinkedIn and X to research, engage, and build relationships with potential buyers over time, replacing cold outreach with visible expertise that makes prospects approach you first. Substack NotesSubstack Notes is Substack's short-form feed where writers post text, links and images to their subscribers and the wider network, functioning as a discovery layer that drives readers toward their longer newsletter posts. Thought leadershipThought leadership is publishing a specific, falsifiable point of view on a problem you have firsthand evidence about, in a way that changes how your audience thinks — as opposed to restating consensus opinions everyone in your industry already agrees with.

Why this glossary exists

Most social-media glossaries are keyword bait: a sentence of filler, a definition that restates the term, and a signup wall. These pages are built the opposite way — each one opens with a definition precise enough to quote on its own, then explains the underlying mechanism, then answers the three questions people actually ask next.

That structure is deliberate. It is what makes an entry useful to a person skimming for ten seconds, and it is also what makes it extractable by search engines and AI assistants answering "what is X." Where a term is contested, disputed, or undocumented by the platform, the entry says so rather than inventing false precision.

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