1. Snapchat and WhatsApp are emerging as dominant photo sharing platforms. Interesting that a main modality for this sharing is private messaging (quasi-ephemeral in the case of Snapchat) versus Facebook’s one-to-many concept of posting to your profile page.
2. Social networking skeptics often decry the use of “friend” as an organizing principle for everyone from your sister to your teammate on the college lacrosse team a decade ago. Fear not: Foursquare and LinkedIn are embracing the follow model.
3. If you’re still trying to get your head around bitcoin, add Stellar to the list of digital currency projects you’ve got to figure out. Backed in part by online payment innovator Stripe, Stellar is a not-for-profit that seeks to expand digital currencies to a  wider audience, and provide an easier way to move money over the internet.
4. Public radio junkies may want to check out the new NPR One app. Native for mobile and web for desktop, the app provides the ability to listen to NPR content in an nonlinear, curated way — and enables serendipitous discovery in the process. Features include the ability to select your home station independent of current location, search from every screen, and an “interesting” button (avoiding the awkward “like” on sobering news pieces). Read an in-depth review.
5. Are your social media posts more popular than you think? This (vendor-written) post explores the varying ratio of creators : commenters : observers online, and offers suggestions for how you might calculate probable reach across the different social networks.

Weekend fun: “We live in a rapidly changing world … the way people get from place to place needs to change, too.” Beyond Uber, there is WYSK.

Every Friday, find five, highly subjective pointers to compelling technologies, emerging trends, and interesting ideas that affect how we live and work digitally. Try out the Friday 5 archive, or sign up to get a weekly email.