When the user wants to write a multi-part thread or content series for Twitter/X, LinkedIn, Threads, Instagram (Reel/carousel/Story series), TikTok (multi-part videos), YouTube (video series, multi-Short series), or Facebook. Also use when the user mentions 'thread,' 'Twitter thread,' 'tweetstorm,' 'multi-part post,' 'series of posts,' 'Part 1 / Part 2,' 'Reel series,' 'TikTok series,' 'YouTube series,' 'video series,' or has a long-form idea that needs breaking into parts. For single posts, see post-writer-sms. For carousels, see carousel-writer-sms.