Ask HN: How can I get my target market out of Facebook and into my platform?

Hello HN, I live in a country where virtually every business related situation is done on facebook groups/pages.

To illustrate here are a few examples :

- If an HR guy is looking for a freelance dev/marketer/whatever for his company, he goes to Facebook freelance groups and just posts about it to get dozens of CVs.

- If someone is looking for a review on a particular restaurant, they go to another facebook group to ask about it.

- If someone is looking to buy a particular item that is not available on the corner of the street, same.

- If someone is looking to get traffic for their new product, facebook groups again.

And the list goes on.

My question is : How can I get those people to ditch facebook and use my platform instead to fill their needs ? OR How can I turn this into my advantage somehow ?

Cheers