Facebook has become an easiest way to make money, either as a side hustle or a job. All it needs to make 50$ and more is hard work and consistency.  Legal and ethical ways that you might be able to make money through Facebook:

 -Selling Items: Consider selling old or unused items through Facebook Marketplace or local buy-and-sell groups.

-Freelancing: If you have skills like graphic design, writing, or programming, you can offer your services to potential clients through Facebook groups or pages.

-Affiliate Marketing: Partner with companies and promote their products or services, earning a commission on sales made through your referral links.

-Online Garage Sale: Organize an online garage sale and promote it on Facebook to sell second-hand goods.

-Social Media Management: Offer to manage social media accounts for businesses that might need assistance with content creation and posting.

-Facebook Ads: If you have experience with Facebook advertising, you can run ads for local businesses to help them reach their target audience.

-Sponsored Posts: If you have a significant following on Facebook, you may collaborate with brands for sponsored posts or promotions.

-Content Creation: Create engaging and shareable content on Facebook, which could lead to monetization through ad revenue or sponsorships.

-Facebook Group Monetization: If you manage a successful and engaged Facebook group, you might charge a membership fee or collaborate with brands for sponsored posts.

-Online Coaching: If you have expertise in a particular field, offer online coaching or consultation services through Facebook.

Remember that making money on Facebook or any other platform requires effort, dedication, and compliance with their policies. Always ensure you are following the platform's guidelines and terms of service