A viewer for public social posts looks simple: accept a handle or URL and display the result. The product decisions become more interesting when the data is incomplete, requests have a cost, and the user needs to know what they will get before paying.
Start with explicit inputs
An exact username, profile URL, or post URL gives the interface a clear target. That is a different promise from keyword search, hashtag search, or a complete archive. Showing the supported inputs next to the form helps people recover from an invalid link without implying that the tool can search for anything.
Separate public access from account access
Not requiring an X login is useful, but it does not mean a tool can reveal private accounts or deleted posts. It also does not mean every feature has no account requirement. A free preview and a separate product account for paid features can coexist; the interface should describe which account is needed and when.
Make metering understandable before a purchase
A useful credit model should state the unit of consumption, the free allowance, and what happens when a request fails. For example, a profile preview might include three posts, while each additional delivered post consumes one credit. If a data source cannot return a post, charging for it would make the result hard to trust. Show the amount and action before the user commits.
Treat missing data as a normal state
Public does not mean complete or permanently available. Posts may be deleted, accounts may become protected, media may be unavailable, and a provider may return partial or cached results. A retrieval timestamp and a clear explanation of missing data are more useful than promising a complete live history.
These are the product boundaries used by Twitter Viewer, an independent browser-based tool for public X profiles and post links. Its free profile preview contains three posts; additional profile posts use prepaid credits. The service is not affiliated with X.
What other UI patterns have you found helpful when a third-party data source can return partial results?
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