FBI requests for customer records under a secret surveillance order rose by almost 50% in 2015, based on an US government transparency report.

A gag order will not need a warrant and generally accompanies an NSL.
The quantity of real written orders fell from 16,348 to 12,870., yet, in 2015 One NSL frequently includes multiple requests for advice, like a string of email addresses considered pertinent to an investigation.
The year-to-year data may not be completely accurate due to changes in reporting demands ushered under a surveil reform law passed by Congress in last year, sources knowledgeable about the procedure said, but they indicate general trends.

Requests on US men decreased. nearly all NSL requests, 31,863, made in 2015 sought advice on foreigners, involving a total of 2,053 people, according to a Justice Department memo sent to Congress, while the quantity
Islamic State, which has recruited understood cyber specialists from printed treatises on communications security and European nations, is famous for using Twitter and other services to radicalize and recruit new adherents.

NSLs are a kind of subpoena power used to compel telecommunications and web firms to deliver customer data.
They may be more often than not accompanied by an open ended gag order issued by the Justice Department barring businesses from revealing contents of the demand for customer data.
In March, the on-line newsgroup Reddit removed a notice from its transparency report suggesting it’d started receiving NSLs, prompting concern from privacy advocates and its users.