There are a couple of web sites (mainly banking) that I can't use PIA with. A couple of things I've noticed, if you hit an "ad" link from google search it gets blocked, logging in to your bank always wants to register a new device, and some cookies get blocked. I use it for all of my devices as a Chrome extension and have been pleased with the performance. I use Chrome because PIA and Lastpass integrate as an extension and I want my web experience as lazy as possible. When I head back to the East coast I switch servers but normally run on the Silicon Valley server. I have no issues with Facebook.