BTC a list of automatically check-in sites for retweet reposts by Bounty 
https://bountyhive.io - it's hard to join the company because the limit is very fast, good companies are good. It's not clear how they keep records
https://bountyplatform.io/ For me the best platform. Everything is convenient, everyone thinks themselves every 24 hours plus select promising projects.
https://bounty0x.io/ A lot of things, it's not clear how to keep records
https://icoreward.com Everything is also convenient, convenient to consider, adequate rules. At the moment one company is available
http://tokengoplatform.com - The site has its own coin, as well as 2 third-party companies
Who will tell you more???
https://bountyhive.io - it's hard to join the company because the limit is very fast, good companies are good. It's not clear how they keep records
https://bountyplatform.io/ For me the best platform. Everything is convenient, everyone thinks themselves every 24 hours plus select promising projects.
https://bounty0x.io/ A lot of things, it's not clear how to keep records
https://icoreward.com Everything is also convenient, convenient to consider, adequate rules. At the moment one company is available
http://tokengoplatform.com - The site has its own coin, as well as 2 third-party companies
Who will tell you more???
in participating in a prize project, there are many ways offered by the prize manager. there are those who have to report every day, so prize participants must report daily what they have done. but by using platfom as you mentioned it makes it easier for bounty hunters to work. usually it is called the Bounty Portal. I'm following the bounty. try to join this gift project, I'm sure this will make it easier for you.