start by reading the terms of use for any of the sites you intend to poll.
then plan on at least one of said sites blocking your service.
think over whether you want to be invested in an arms race, or if you have any interest talking directly with the companies whose services you would monitor.
tl;dr think about the non-code parts very carefully before taking any architectural advice you get here and running with it.
then plan on at least one of said sites blocking your service.
think over whether you want to be invested in an arms race, or if you have any interest talking directly with the companies whose services you would monitor.
tl;dr think about the non-code parts very carefully before taking any architectural advice you get here and running with it.