Adam Satariano

In London, Facebook’s chief technology officer, Mike Schroepfer, faced more than four hours of questions from a British parliamentary committee over the company’s data-collection techniques, oversight of app developers, fake accounts, political advertising and links to the voter-targeting firm Cambridge Analytica. If American politicians have been lampooned for being Luddites, the British Parliament’s Digital, Culture, Media and Sport Committee has built a reputation for thoroughness and detailed questioning.

In Europe and the United States, the conventional wisdom is that regulation is needed to force Silicon Valley’s digital giants to respect people’s online privacy. But new rules may instead serve to strengthen Facebook’s and Google’s hegemony and extend their lead on the internet. That’s because wary consumers are more prone to trust recognized names with their information than unfamiliar newcomers.

Amazon is taking a hit in states that are collecting an online sales tax. In one of the first efforts to quantify the impact of states accruing more tax revenue from web purchases, researchers at Ohio State University published a paper that found sales dropped for Amazon when the online charge was introduced.

In states that have the tax, households reduced their spending on Amazon by about 10 percent compared to those in states that don’t have the levy. For online purchases of more than $300, sales fell by 24 percent, according to the report titled “The Amazon Tax.” The findings add to concerns about how much the world’s largest online retailer can expand.

The company has been grappling with decelerating revenue growth amid heavy spending by Chief Executive Officer Jeff Bezos on new initiatives. Amazon has enjoyed an edge against brick-and-mortar retailers because consumers didn’t have to pay a sales tax for purchases from the e-commerce site, yet that has eroded as states including California and Texas have unveiled the levies.