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I do regularly participate in twitter contests and giveaways from casinos I trust like roobet, but winning those contests is very rare.
Obviously because the amount of people hunting those contests and giveaways are insane. Besides that, most of those has a very easy requirement to join which is usually only by like and retweets so yeah tons of throw away accounts would join those. Any of us in bitcointalk has better chance on winning something in these bitcointalk exclusive contest rather than twitter's contest
I think I've only not won twice from the day I started participating in Roobet art contest here in BitcoinTalk.
Oh boy, how I love to win one of this someday but I dont think I can with all those amazing arts