Social media companies are blocking posts related to the war on Gaza to comply with the UK's new Online Safety Act, which came into effect on 25 July.
BBC Verify found that content on X and Reddit has been restricted on X for those who have not verified their age on the sites. The content includes topics from the war on Gaza and Russia's invasion of Ukraine, to parliamentary debates on grooming gangs.
The report highlighted that a video posted to X of a man in Gaza searching for his family members under the rubble of buildings destroyed by Israel had been restricted, despite not showing dead bodies or graphic images.
Users who did not verify their age were met with a message reading: "Due to local laws, we are temporarily restricting access to this content until X estimates your age."
X removed the warning after being approached by BBC Verify.
At the same time, users also received a warning under videos of a Shahed drone being destroyed mid-flight in Ukraine, despite the clips not showing death or injury.
BBC Verify revealed Reddit has also introduced similar limitations, having users log in to confirm their age when accessing pages related to Israel's war on Gaza and the Ukraine conflict.
The publication said it is unclear how many posts are being restricted.
Other blocked content includes parliamentary debates and an image of Francisco de Goya's 19th-century painting entitled Saturn Devouring His Son, which shows the Roman deity Saturn eating one of his children.
BBC Verify said the examples were focused on X and Reddit as they flag age-restricted content, while Meta has a different system where "teen" profiles have parental control, making it difficult to identify restricted content.
Under the new law, social media companies and other websites will be fined up to £18 million or 10 percent of their global revenue or potentially blocked if they fail to protect young people from harmful content, including pornography, violence and promoting self-harm.
Experts warned that "overapplying" the law risks limiting public debate.
X owner Elon Musk has slammed the Online Safety Act, suggesting that it might stop companies from launching products in the UK.
Social media sites have long been accused of shadowbanning and blocking pro-Palestinian content online, including Meta, Reddit and X.