Melissa wants to send me $800000

[RapTarX]

I just have received a PM in my airtel number that there's a lady namely Melissa who wants to send me $800000 for the local charity. I guess all of you know the typical kinda scam attempt. But what I'm wondering that how come it’s a direct PM to my airtel number? Is it possible that the sender know me personally? May be someone I know trying to trick me to scam?
Be aware anyway, don't trust their words and contact them.