This is what I’m working on https://pegao.co:
☑ Login with Google.
☑ Save links easily.
☑ Lists of links.
☑ Organize links quickly with emojis :)
☑ Filter by emoji or list.
☑ Public profile (your full name and photo on Google, username and all links).
☑ Follow people.
☐ Login with Twitter, GitHub.
☐ Account page features (Customize interests, email notifications and so on).
☐ Search by…
☐ Private profile.
☐ Follow sources.
☐ Documentation (help, source, etc)
…and the list keeps growing.