Teen social app has raised a $2.63m (€2.5m) pre-seed funding round led by Accel. Also participating was 20VC. Additional investors including Supercell Co-Founder and CEO Ilkka Paananen, Behance founder Scott Belsky, football star Mario Götze, Kevin Weil (Scribble Ventures) and musician Alex Pall (The Chainsmokers).