Facebook, Inc. v. Duguid
The Supreme Court unanimously ruled that Facebook's login-alert text system was not an illegal 'autodialer' under federal consumer protection law, because the system did not use a random or sequential number generator to produce phone numbers.
The decision significantly narrows who can be sued under the Telephone Consumer Protection Act, limiting the law to equipment that actually generates random or sequential numbers — and shielding the many modern systems that simply dial from stored lists.
How it got here: A federal district court dismissed Duguid's lawsuit; the Ninth Circuit reversed, holding Facebook's system was an autodialer; Facebook asked the Supreme Court to hear the case and the Court agreed.
The Case in Depth
What happened
Facebook offers a security feature that texts users when someone tries to log into their account from an unfamiliar device. Noah Duguid, who never had a Facebook account, began receiving these alerts because his phone number was somehow linked to another user's account. After repeated failed attempts to stop the messages, Duguid sued Facebook as part of a proposed class action, arguing that Facebook's automated texting system was an illegal "autodialer" under federal law.
The question before the Court
Does federal law protecting people from unwanted automated calls and texts — the law that targets "autodialers" — cover a company that automatically sends texts to stored phone numbers, even if it never randomly generates those numbers?
The Court's answer
No — Facebook's login notification system was not an illegal autodialer under the Telephone Consumer Protection Act. The law defines an autodialer as equipment that uses a random or sequential number generator to either store or produce phone numbers to be called. The key phrase "using a random or sequential number generator" modifies both functions — storing and producing — not just the closer verb "produce." Because Facebook's system simply stored phone numbers linked to user accounts and texted them automatically, without ever generating numbers randomly or sequentially, it fell outside the law's definition.
The Court rejected the argument that any device capable of storing and automatically dialing numbers qualifies as an autodialer, finding that reading would sweep in virtually every modern cell phone — an outcome Congress plainly did not intend. If Congress wants the law to reach modern automated texting systems more broadly, it must update the statute; the Court can only enforce the law as written.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Businesses that send automated texts or calls using stored customer lists — rather than randomly or sequentially generated numbers — face far less exposure to Telephone Consumer Protection Act lawsuits, which can run up to $1,500 per message. Consumers who receive unwanted automated messages from such systems will have fewer federal legal remedies available to them.
What changes now
The case is sent back to the Ninth Circuit for further proceedings consistent with the Supreme Court's ruling. Duguid's class action against Facebook is unlikely to survive, because his complaint did not allege that Facebook's system used a random or sequential number generator. Going forward, plaintiffs bringing TCPA autodialer claims must show that the defendant's technology actually generated numbers randomly or sequentially — a significantly higher bar than merely showing the system stored and dialed numbers automatically.
What this does not decide
The Court did not address the TCPA's separate prohibition on calls using artificial or prerecorded voices, which applies regardless of what type of technology is used and was not challenged here. The ruling also does not address whether Congress should modernize the autodialer definition to cover newer automated calling technologies.
Concurrences and dissents
Concurrence — Justice Alito
Justice Alito agreed with the outcome but wrote separately to caution against the majority's heavy reliance on the 'series-qualifier canon.' He argued that interpretive canons are useful tools, not rigid rules, and that the plain sense of a sentence as a fluent English speaker would understand it should guide courts more than mechanical application of grammatical formulas. He warned that treating canons as fixed rules can push judges toward algorithmic, if-then interpretation, and that the series-qualifier canon in particular is highly sensitive to context and frequently unreliable.
How the Court got there
The legal reasoning, step by step
- The Court's central task was reading the TCPA's autodialer definition: equipment with the capacity 'to store or produce telephone numbers to be called, using a random or sequential number generator.' The dispute was whether the phrase 'using a random or sequential number generator' applies to both verbs ('store' and 'produce') or only the closer one ('produce').
- The Court applied the 'series-qualifier canon' — a standard reading rule providing that when a modifier follows a list of verbs or nouns sharing a parallel grammatical structure, the modifier normally applies to the entire list. The Court found this canon naturally fit the statute, which links 'store' and 'produce' through the word 'or' with a single shared object, making them a unified grammatical unit rather than two separate items.
- Three textual features reinforced this reading: first, the two verbs share one common object ('telephone numbers to be called'), functioning as a cohesive unit; second, a comma separates the modifying phrase from the verb list — a signal that the modifier applies to everything preceding it, not just the last item; third, the competing 'last antecedent' rule (which says a modifier attaches only to the nearest word) does not apply when a modifier follows an integrated clause, and in any event, the last antecedent was 'telephone numbers to be called,' not 'produce.'
- The broader statutory context confirmed the narrow definition. Congress specifically targeted equipment that could randomly dial emergency lines or sequentially tie up every phone line at a single business — precise, limited harms. A broader reading covering any device that stores and dials numbers automatically would turn ordinary cell phones into potential TCPA violators, an absurd result Congress could not have intended.
- The Court rejected Duguid's call to read the law as an adaptable tool for modern technology, holding that updating outdated statutory language is Congress's job. The law requires a random or sequential number generator; Facebook's system has no such feature and therefore is not an autodialer.