Twitter begins rolling out Twitter Retailers in beta, letting customers hyperlink to as much as 50 objects from their profiles, to pick US retailers on iOS (Chaim Gartenberg/The Verge)

Substack launches an iOS app for reading; Android users can sign up for a waiting list  —  What you learn issues  —  Right now, we’re launching an iOS app for studying.  It is like your e-mail inbox, however higher.  —  For readers, the app brings all of your Substack subscriptions collectively in a single venue …