By Cat Zakrzewski 

Ever since former NSA contractor Edward Snowden revealed the breadth of U.S. electronic surveillance, tensions have simmered between the government and technology companies over access to users' online communication. Congress is now raising the stakes.

The Senate Intelligence Committee included language in an annual intelligence-funding reauthorization bill last month that would require companies such as Google Inc., Facebook Inc. and Twitter Inc. to disclose any content they spot on their networks that could indicate terrorist activity. The proposed measure could cover everything from emails to tweets to videos.

The move comes as law enforcement struggles to deal with the increased use of social networks for recruitment and planning among terrorist groups, such as the Islamic State's use of Twitter.

The companies don't want terrorist activity on their sites, but they also don't want to play the role of cops. Both Yahoo Inc. and Google cited a recent post from the Center for Democracy and Technology, a nonprofit focused on privacy in Internet communications, that said the bill "would turn online service providers into law-enforcement watchdogs."

Facebook, Twitter, Yahoo and Google all declined to state a position on the measure.

The new provision is modeled on existing federal requirements for policing child pornography. However tech company officials say weeding out terrorist messages is much more complex. Companies often become aware of terrorist activities after users flag them on their platforms, unlike child pornography, which is identified by software.

"When it comes to child exploitation imagery, distribution or possession of the image is a crime. No additional context is necessary," said Monika Bickert, Facebook's head of policy management. "Detecting social media activity associated with terrorism is very different. It is subjective and requires an incredible amount of context."

The bill includes a privacy clause that states a service provider isn't required to partake in additional monitoring of individuals.

David Grannis, an Intelligence Committee minority staff director, said the only change for companies is that they would be legally required to take the extra step of reporting terrorist content to the authorities after receiving a report from a user.

"Companies are already in the business of making a determination of what this terrorist content could be," Mr. Grannis said.

Twitter is already increasing its staff to respond to a rise in all user reports, not just those pertaining to terrorism. In February the company said it tripled the size of its support team to review more than five times as many user reports as it did previously.

Companies also are under pressure to weigh consumers' privacy over investigations.

"We've seen in response to the Snowden revelations that people and providers are trying to limit the access the government has to their communications," said Emma Llansó, the director of the Free Expression Project at the Center for Democracy and Technology. "The government is responding by trying to obtain greater and greater access."

Federal Bureau of Investigation director James Comey has called for the government to require companies to give law enforcement access to encrypted communications on Apple and Google phones.

Each company has a different response to the presence of alleged terror-group activity on their sites, mandated by the companies' terms of service. Facebook is the strictest and doesn't allow any terrorist content. Facebook's Ms. Bickert said, "Our policies on this are crystal clear: We do not permit terrorist groups to use Facebook, and people are not allowed to promote or support these groups on Facebook. We remove this terrorist content as soon as we become aware of it."

Twitter has come under fire from lawmakers for not taking down content. Recent reports have detailed how terrorist groups such as the Islamic State are using Twitter to recruit new members and plot attacks.

"We review all reported content against our rules, which prohibit unlawful use, violent threats, and the promotion of terrorism," a Twitter spokesman said. "Law-enforcement authorities can request information about individual Twitter accounts through valid legal process outlined on our site."

Critics also have said the new provision doesn't specifically define what terrorist-related content is.

Mr. Grannis said the provision's language was broad because it is difficult to identify a "discrete list of items that could fall under the rubric of terrorist activity."

The reauthorization bill awaits debate on the Senate floor, which likely won't occur until the Senate returns from its summer recess.

Some question if the legislation is even needed. Requiring companies to provide this data to the government could prompt them to overreport terrorist activity so they aren't blamed in the event of an attack, civil-liberties proponents say.

Mr. Comey, the FBI director, said at a recent hearing that technology companies "are pretty good about telling us what they see." He declined to comment specifically on the provision. The same week, he disclosed the FBI recently used information found on Twitter to thwart potential terrorist plots over the July 4 weekend.

Write to Cat Zakrzewski at cat.zakrzewsk@wsj.com

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