Katy Perry is the most followed person on Twitter.
As a result, her posts reach more people than any other account on the social media site.
So accuracy, when it comes to tweeting about current affairs and tragedies - like the Malaysian Airlines MH17 plane that crashed on the Russia-Ukraine border killing 298 - is key.
And it was accuracy that was sadly lacking from the 29-year-old pop singer's sorrowful post about the disaster.
Perry, who was named a UNICEF Goodwill Ambassador last year, gave her condolences to the families who have lost love ones in the tragedy. Including to "100 UNICEF volunteers".