When you have to tag 2 friends but have none in the list :p
There are no such giveaways at this moment 
but it's easy to make friends on social media even if you are introvert because no one knows your personality and i think 2 friends is normal and you would find most giveaways with these rules..What do you mean by "There is no such gevaway at this moment"? Did you not see the twitter link posted by aysg76?
All you have to do is follow, like and retweet, tag 2 friends, and comment your Roobet username, and Roobet will award 5 lucky winners with $500 each.
https://twitter.com/Roobet/status/1461469272455061507?s=20