About activity Streams and API Maybe some tips to pickup here
https://stackoverflow.com/questions/1443960/how-to-implement-the-activity-stream-in-a-social-network
https://backchannel.org/blog/friendfeed-schemaless-mysql
http://lea.verou.me/2015/08/copying-properties-the-robust-way/
( https://blog.medium.com/what-are-bloom-filters-1ec2a50c68ff )
https://stackoverflow.com/questions/1443960/how-to-implement-the-activity-stream-in-a-social-network
https://backchannel.org/blog/friendfeed-schemaless-mysql
http://lea.verou.me/2015/08/copying-properties-the-robust-way/
( https://blog.medium.com/what-are-bloom-filters-1ec2a50c68ff )