A lot of Facebook, Twitter, Google, etc. can be localized. People 'Like' button local businesses live near their friends, they mostly follow people who produce lots of content, they search for local and regional businesses.
Caching is a real business case for 'personalizing experiences'. I don't get a lot of Australian news in my searches. Instead, I get my probable biases confirmed. Twitter encourages me to follow my local handegg team. Facebook trickles my more geographically distant friends and family into my feed.
The common denominator is part of the algorithm and its just not worth the bandwidth to serve the long tail.
Facebook's CDN: http://stackoverflow.com/questions/19568411/list-of-facebook...
Caching is a real business case for 'personalizing experiences'. I don't get a lot of Australian news in my searches. Instead, I get my probable biases confirmed. Twitter encourages me to follow my local handegg team. Facebook trickles my more geographically distant friends and family into my feed.
The common denominator is part of the algorithm and its just not worth the bandwidth to serve the long tail.