Pinboard is a fast, no-nonsense bookmarking site for people who value privacy and speed.
There are no ads and no third-party tracking. You pay a few bucks a year, and that's it.
Pinboard lets you bookmark from any browser, connect up to three Twitter accounts (and favorites), and sync with popular services like Instapaper or Pocket.
For a few more bucks a year, Pinboard offers an archiving service which saves a copy of everything you bookmark, gives you full-text search, and automatically checks your account for dead links.
Take a quick tour of the site to see the kinds of things it can do.