Just try gleam.io. It is popular in making giveaways but if this is a market manipulating job, you might have a hard time allocating a huge amount of users in the forum that would risk their money to be a bull in a bearish market. Giveaways aren't really an option for this kind of query, unless you want to somehow shill a certain altcoin. If shilling or reviving an altcoin is your idea, having a better marketing should be your choice. Overall, this forum isn't really fit for certain giveaways.