News aggregator Feedly has neutralised a distributed denial of service attack that shut down its service yesterday.
Feedly said in a blogpost that it was attacked and held for ransom by the attackers, but worked with other victims of the same group and law enforcement agencies to tackle the threat.
In an update on its blog later in the day, Feedly said: "We have neutralized DDoS attack that began at 2:04am PST last night. You should now be able to access your feedly from both feedly.com, mobile apps and third party applications."
The firm said that its 15 million users' data has not been compromised in the attack.
Evernote experienced a similar attack on Tuesday but it is not known if it was a case of extortion.
Evernote spokeswoman Ronda Scott told the BBC: "We continue to mitigate the effects of the attack, but have successfully returned Evernote to service.
"As is the nature of DDoS attacks, there was no data loss, and no accounts were compromised."
Evernote also suffered a hacker breach last March.
According to a report released by Neustar in April this year, DDoS attacks on businesses doubled in 2013, with over 40% of victims estimating their losses to be more than $1m a day.