Last time I was thinking about the social media bounty campaign which is my friend is joining. He has more than 30 ICOs bounty campaign in his list. He posted 30 or more in a day to met the requirements of an ICO.
Your friend surely is a bounty hunter.is it possible that the facebook account of my friend will be ban in the future?
Why would he ban? Facebook is mostly a freedom wall where we can post anything that we want as long as there's no violation from the rules and agreement made by facebook. There are posts that are gross and brutal killings those people who keep on posting should be banned but it keeps on going. Facebook's popularity is increasing and they are also having hard time of battling those gross posts.
When the facebook developers becomes aware on this activity. Will his activity on facebook will fall as a spam? 
If your friend keeps on spamming with different groups and there are people who are reporting his post then he can be but if he's only posting on his wall, there's no problem with it.