For run Twitter campaign..
How much cost retweet and tweet / per follower?
Usually, twitter campaign will be minimum 800 Followers (real followers) and got paid
BTC0.0002-
BTC0.0004 depend on yours, cause i didnt see anything lower than
BTC0.0002 for twitter campaign.You can use that fix rates, a lot twitter campaign use that. OR You can customize it like this
800-1500 Followers :
BTC0.0002
1501-2500 Followers :
BTC0.004
and more, you can try your rates.