Google API for location, based on user IP address
http://stackoverflow.com/questions/17402103/google-api-for-location-based-on-user-ip-address

email發送服務
https://postmarkapp.com/
https://sendgrid.com/user/signup

大量發送email不被擋信要領
https://ihower.tw/blog/archives/3481

IP查詢API
http://ip-api.com/json/

IG API教學
http://marcoyan0814.blogspot.tw/2014/05/instagram-api-user-id.html
http://qiita.com/zurg/items/4c423b93b6a7f1ac737d

Google Geocoding API
https://developers.google.com/maps/documentation/geocoding/intro
https://maps.googleapis.com/maps/api/geocode/json?address=台北市南港區重陽路72號&key=AIzaSyDemQt8I1VVTkAEbHot5VXdJsjQvcSp41Q

臉書更換token
http://marcoyan0814.blogspot.tw/2015/05/facebook-access-token-2-60.html
http://blog.rx836.tw/blog/facebook-app-create-getfbid/
http://sweeteason.pixnet.net/blog/post/40581580-%E7%B6%B2%E7%AB%99%E5%88%A9%E7%94%A8-facebook-%E5%B8%B3%E8%99%9F%E7%99%BB%E5%85%A5-(%E4%BD%BF%E7%94%A8-oauth)

google、FB、Twitter社交登入API教學
http://www.cc.net.tw/2014/05/2762/
http://veckcode.blogspot.tw/2013/09/twitter-apirest-api-streaming-api.html

輕量級地圖圖資
http://simplemaps.com/resources/world-cities-data