Lots of HR roles in there which is usually where recruiters are positioned. Unless you are saying all twitter recruiters on payroll are US citizens or permanent residents. Be sure to search all years.
Even selecting all years, I see no evidence of Twitter having H1B recruiters, and I don't think this is surprising. Companies are prepared to go through the process (and can make a credible claim of needing it) only for some roles.
- I think in general _recruiters_ are not on H1Bs. And even for jobs held by people who _are_ on H1Bs, that can be a biased data source for salaries.
- And sure enough of the info for twitter H1Bs, I see no recruiters. Plenty of engineers, a bunch of data scientists, some managers and directors, but no recruiters. https://h1bdata.info/index.php?em=Twitter+Inc&job=&city=&yea...