The app most likely is Two Dots ; its branding and app listings explicitly use two dots as the main visual identity.

Why this fits

  • The game’s official presence calls it “Two Dots,” which matches the “two dots” clue directly.
  • It’s a popular mobile app, but it is a game , not a traditional social media app.
  • If you meant a social platform with a dots-based logo, another possibility is Flickr , which is often associated with two colored dots in its logo and brand imagery.

Most likely answer

  • Two Dots if you’re remembering an app icon with literally two dots.
  • Flickr if you mean a photo-sharing social app with a two-dot logo concept.

TL;DR

Most likely: Two Dots. If you want, I can also list other social apps whose logos use dots or circles.