The gambling community of a popular casino must be very active in sharing news or anything about the casino so it doesn't take long to find out.
And Twitter is still the choice of many of those casinos, even though it may be more advanced now than it used to be.
The gambling community is very active on twitter and always looking for such promotions but them casino is not using bots but there are many bot account hunting for giveaways tweets what is being said above.But still casinos have twitter as the most suitable choice for any advertisement.