Pocket is a social bookmarking service that can be integrated into a website with the use of a web widget.
https://getpocket.comTop Websites
- bunshun.jp
- livedoor.jp
- cly7796.net
- dekiru.net
- 0matome.com
- ascii.jp
- abdurrahman.org
- zdnet.com
- al-gest.com
- liginc.co.jp