Votum for Slack - Crowdsourced lists with upvotes, inside Slack
7reads - A minimal mindful reading list for Google Chrome.
Must-Read for Slack - Build controllable must-read lists for your team in Slack.
Readonomy - Shared reading list and bookmarks for teams.
7 Speed Reading - Learn to read 3x faster
Save on Facebook - A Read-It-Later List For Links, Places, And Media Pages.