The number of reports on the crowd-sourced DownDetector website - one of the internet's most used sources of numbers on outages - peaked at just over 12,000, gradually falling to a couple of hundreds by early Thursday.
Facebook and its network of apps have been suffering connectivity issues for over five hours now.
Ironically, Facebook had to take to Twitter to announce that they are "aware that some people are now having trouble accessing the Facebook family of apps". "We're working to resolve the issue as soon as possible", the company said on social media.
A Facebook spokesperson this morning also told 9news.com.au it is working to fix the outage.
As far as we're aware, Google is back to normal by now, and Facebook is still working to right its servers and connectivity.
Some users took to Twitter to air their grievances.
For our newsroom, the outage has been preventing any new posts to our Facebook page or responses to user comments.
Angry users expressed their frustration on Twitter writing, "There is some serious problem with Instagram".
A DDoS attack is a distributed denial-of-service disruption that attempts to interrupt the normal stream of traffic using a network.
Akvile DeFazio, a social media advertiser with her own agency, Akvertising, says she has been in touch with Facebook representatives.
Regulators, and now prosecutors, appear intent on determining whether this was done in ways that let users know what was happening and protected privacy. Some users have regular access, and some have intermittent access.
The issues affected users around the globe, with people in the US, Europe, Asia, Australia, and South America reporting problems.