Reach
Content Reach
The total number of unique users who saw a piece of content, distinct from impressions which count repeat views.
技术细节
Reach affects how content appears when shared across social media platforms. Social platforms use link preview crawlers that fetch and parse meta tags from shared URLs. These crawlers cache aggressively — changes may take hours to propagate. Each platform has its own debugger tool (Facebook Sharing Debugger, Twitter Card Validator, LinkedIn Post Inspector) for previewing and clearing cached link previews. Properly configured social metadata can increase click-through rates by 30-50% compared to links without preview images.
示例
```html <!-- Reach: social markup example --> <meta property="og:title" content="Page Title"> <meta property="og:description" content="Description for social sharing."> <meta property="og:image" content="https://example.com/image.png"> ```