There are several ways that a real estate agent can use Facebook to generate leads:

1. Use Facebook Ads to target specific demographics and locations: Facebook Ads allows you to target users based on their location, age, interests, and other factors. By targeting the right demographics, you can effectively reach potential clients who are interested in buying or selling a home.
2. Join local Facebook groups and participate in discussions: Many local communities have Facebook groups where people discuss real estate, housing, and other related topics. By joining these groups and actively participating in discussions, you can establish yourself as a knowledgeable and helpful resource, which can lead to leads.
3. Share informative and engaging content: Share blog posts, articles, and other content related to real estate on your Facebook page. This can help establish you as an expert in the field and attract potential clients who are interested in learning more about the real estate market.
4. Use Facebook Live to showcase properties: Facebook Live allows you to stream video in real-time to your followers. Use this feature to give virtual tours of properties you are listing, or to host Q&A sessions about the real estate market.
5. Utilize Facebook Messenger: Use Facebook Messenger to connect with potential clients and answer their questions about the real estate process. This can be an effective way to build trust and establish yourself as a helpful resource.

Overall, the most effective way to generate leads on Facebook is to be active and engaged, and to provide value to your followers by sharing informative and helpful content.