I think the article is wrong on the definition of "about data." The definition I read was, "about data" is information that mentions a foreign intelligence targ

I think the article is wrong on the definition of "about data." The definition I read was, "about data" is information that mentions a foreign intelligence target, even if it's sent between two Americans domestically. This was, apparently, perfectly legal to query as long as you were querying a foreign target. The NSA overstepped pretty egregiously and had to shut those queries down. The article say it's data "about" Americans, which is true but confusing.