Social media platform X was down for thousands of users, according to Downdetector.
More than 5,600 people reported issues with the social media platform on Tuesday morning.
Cloudflare, a web infrastructure company, also had problems impacting other services.
It is unclear whether the outages were related.
“We are working to understand the full impact and mitigate this problem. More updates to follow shortly,” Cloudfare said on its status page.
It later added: “We are seeing services recover, but customers may continue to observe higher-than-normal error rates as we continue remediation efforts.”
OpenAI, Facebook, AWS (Amazon Web Services), bet365, Canva, Spotify, BrightHR and League of Legends also suffered outages, according to Downdetector.com.
Graeme Stuart, head of the public sector at Check Point, a cybersecurity firm credited with creating the first firewall, said: “Cloudflare going down today sits in the same pattern we saw with the recent AWS and Azure outages. These platforms are vast, efficient and used by almost every part of modern life.”
“When a platform of this size slips, the impact spreads far and fast and everyone feels it at once,” he explained.
Mr Stuart said that the reported outages didn’t happen because each organisation failed on its own, but because “a single layer they all rely on stopped responding”.
“Many organisations still run everything through one route with no meaningful backup. When that route fails, there is no fallback. That is the weakness we keep seeing play out,” he said.
“The internet was meant to be resilient through distribution, yet we have ended up concentrating huge amounts of global traffic into a handful of cloud providers. (Sky News)