I would advise against it.
While I wouldn’t flinch if someone tried to hire me via my social media, understand that while it is “public domain,” it is a safespace for some working guys. Whether you saw their ad elsewhere, know for a fact they are an escort, or you’re idk...clairvoyant, I don’t think it’s a good idea and it can come across as invasive. Contact them from the portal in which you know you can find their ad. While I wouldn’t mind, and it has happened, I kindly redirect the individual to where my ad can be found. I think it’s a more productive route than propositioning hot guys on IG.
Additionally, with social networks Facebook and Instagram, I always feel like ‘big brother’ is watching because of all the security loopholes. That’s not to say something couldn’t be happening on RentMen but, you understand.