Historical clue formulations

• App originally called Picaboo — 2024-05-10
• Popular app originally launched under the name Picaboo — 2022-11-03
• Instagram rival — 2018-05-26
• Most-downloaded app of 2016 — 2017-01-25
• Instagram alternative — 2015-05-08
• Disappearing communication system? — 2015-03-28
• Medium for many selfies — 2014-08-17