Pinboard
Used by 21 peoplepinboard.in ↗

“Pinboard - anything interesting I see on the internet I bookmark it on Pinboard for safe keeping and easy retrieval later.”
Anthony Agius Interview, Writer, Editor (The Sizzle) · via Uses This 
“I use Pinboard to catalog my web excursions.”
Marius Eriksen Interview, Software developer (Twitter) · via Uses This 

“Pinboard keeps my link library organized and Otlet's Shelf keeps my book library organized.”
Rob Giampietro Interview, Designer (Project Projects), writer · via Uses This 

“I still maintain my bookmarks locally instead of using Pinboard or other link aggregators.”
Robert Hodgin Interview, Code artist · via Uses This