Platform footprint
Start with where people actually participate.
A platform checklist establishes the respondent's relevant universe. Separate current use from account ownership and set a recent window, such as the past seven or thirty days, so an abandoned account is not counted like an active habit. Use the selection to control later branches.
- Platforms used within a specific recent period.
- Primary or most-used platform when one comparison is needed.
- Active posting, messaging, browsing, or no current use.