For me they are tools for work and they are the web apps that I use the most every day (I work remotely). Trello is a task management system where you organize tasks as drag-n-drop &quot;cards&quot; and Slack&#x2F;Gitter are chat apps (Slack is for company chat and Gitter is for my open source project community).<p>I do use Youtube&#x2F;Facebook&#x2F;Twitter etc as well, but I use them primarily for content consumption for entertainment, so my usage patterns of those services wouldn&#x27;t be affected much if they were written without using javascript at all. In contrast, drag-n-drop and the ability for real-time collaboration are the killer feature of Trello (for me), and obviously there&#x27;s no way web chat would ever work smoothly without js.