Five hundred thousand smackers.
What we in the legal field refer to as multus of scabere [“A lot of scratch”].
Selena Gomez is rumored to charge roughly this amount to promote a sponsor in a single post across her social media accounts. Of course, Ms. Gomez has 124 million followers on Instagram, 50.4 million on Twitter, and 60 million on Facebook. Your numbers almost certainly pale in comparison. Nonetheless, social media can produce a lucrative audience if you can develop a substantial or focused following.
Is building a following on social media platforms without risk?