Our national broadcaster NRK had a series[1] specifically about suicide amongst teenage girls and their use of Instagram. From what they found[2], one suicide would trigger other attempts, often copying the method used.

It seems clear to me this isn't random.

[1]: https://www.nrk.no/emne/trigger-warning-1.14739155

[2]: https://www.nrk.no/spesial/det-skjulte-nettverket-1.14739159