Tipping in social networks have been tested in every cycle since at least 2013. ChangeTip made micro-tipping a thing first in December 2013. 

My observations:
1 - every cycle tipping meta grows. an entire generation has grown up with online tipping now.
2 - tipping with tokens that fluctuate in value leads to regret. imagine tipping $1 of btc when btc was worth $10. that’s 10k now. the reverse is true for tokens that crash in value when you get to tax time. 
3 - no-matter how big tipping gets, micro-collecting will be much larger market bc people like to get something for the money. 

