In simplest words about ICO and bounty campaigns.

About cryptocurrencies and, in particular, about Bitcoin heard many. What it's not going to grovel. And that's about it, they are taken to market, a couple of lines to write.
I want to notice that now on the market represented a total complexity far over 800 different cryptocurrencies. And they all are traded on exchanges. Bitcoin just appeared much earlier others talking about him in the news he was hearing at all.
So, what I wanted to say. Suppose some team (programmers, marketers, etc.) has created a new cryptowall. As they bring it to the market? And so it in all this crazy amount of other crypts.
Response: conducting baunty campaign. This is something like word of mouth radio. To encourage the society to promote a new coin creators in the initial phase (until the elimination of coins on of the exchange) give them away for FREE. Registration in the project and for referring friends through your referral link. For this are identified not all tokens from the total number, but some of them part.
Available for sale these tokens become, of course, not immediately, but some time after withdrawal to the exchange.
So participate. You it costs nothing, and takes time quite a bit (about 5 minutes, half hour, because you need to perform some additional steps, like verification phone numbers, subscribing to social media groups, etc.)
PS. If you can see good prospects of the project, conducting ICO (initial placement of coins), many people invest their money in such ICO as in the initial phase the coins are only handed out but and sell with big bonuses.
P. P. S. on 4 January 2016 was launched at that time little known coin Decred (DCR).
When you run the project conducted a bounty - anyone had 282 coins. Now (16.12.2017) one coin Decred (DCR) costs $69! 282DCR x $69=$19458!
And that's not counting the POS mining this coin (nothing complicated, just needed not to withdraw the money immediately at the first opportunity to sell them) in which a patient was able to increase their 282 DCR coins, turning them around 3000 DCR! I.e. $207000!
Or, for example, if you participated in the bounty with the launch of Ethereum (2014). and earned without investing 1000 ETN, exchanging at today's (15.12.2017) rate ($648), would receive ... the Key word is "would have"...