Twitter International is a subsidiary of Twitter, but it still has its own board, consisting of Macgillivray, Twitter's general coujnsel; Twitter COO Ali Rowghani; and Robert O'Shea, a partner at the Irish law firm Matheson who specializes in creating such international corporate structures.acgillivray's directorships came to light when we downloaded an annual report for Twitter International, Twitter's Irish subsidiary through which it runs its fast-growing overseas businesses. Twitter has been a voracious acquirer of smaller companies since its purchase of Summize five years ago, as we've noted.