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In the past, when I was more active on Betfury, I always shared my wins/dividends and got lucky 3 times in fact, but the price you won was a lot lower lol. If you are already playing, than sharing a win is a small task and with some luck, you can score an easy 40$.
Did that affect yout twitter following? I've tried not to constantly spam my followers with this kind of stuff as i want to keep my account "real" and not bot-like. Also sharing how much i actually have won seems highly personal even though i have pseudonymous account.
That said i totally understand this kind of advertising and i might participate if the prizes were worth creating spam with my account.