Yeah you certainly need to join and follow the official twitter account of team on twitter to follow any updates as there might be scammers trying to impersonate themselves as real team but the actual risk will arise if they ask you to click on some links or ask to connect wallet in any case so be sure to avoid such things as much you can for fund safety and participate in these contest with fun manner.
There are many funny people who end up with something like acting as if they are Elon Musk, or Jeff Bezos or whoever under the tweets with "we are giving away free ETH" and make you click phishing links. The same happens for companies too, they end up with putting links under the replies of rollbit and they may try to trick you as well.
So it is a lot better if you end up being more careful, if you are careful enough then they will not be a problem, but that doesn't mean that it would really is fine, it’s a terrible thing but it works well for them and it shouldn't really be a big deal at all, it’s going to be something annoying at worst.