IN October 21 2016, Twitter and other popular website were hacked by a group of people who are still behind bars. No one claimed responsibility for the attack, and the case is still under investigation looking for any cyber activities going on
A lot of people faced problems login into their twitter accounts.
What they did is that they created much traffic to the DNS servers making difficult for them to be unknown in taking illegal actions. One of the reason of these attacks was to check the weakness of their website and proving what they are capable of.
DYN a company that act as host for a lot of websites such as twitter, Spotify and others experienced an attack which affected their system