Determining the "best" SMM panel for Facebook can be subjective, as it depends on your specific needs and preferences. However, there are several popular and reputable SMM panels that are commonly used for Facebook marketing. Here are some well-known SMM panels for Facebook:

1. SMMHut: SMMHut is a widely recognized SMM panel that offers various services for Facebook, including page likes, post likes, comments, shares, and more. They have a good reputation and provide options for targeting specific countries or demographics.

2. SocialPilot: SocialPilot is primarily known as a social media management platform, but it also offers SMM services for Facebook. With SocialPilot, you can schedule and manage posts, analyze performance, engage with your audience, and even run Facebook ad campaigns.

3. Famoid: Famoid is known for its Facebook services, including page likes, post likes, followers, and comments. They claim to provide real and high-quality engagement for Facebook pages and posts.

4. SMMKings: SMMKings is a popular SMM panel that provides services for various social media platforms, including Facebook. They offer options for increasing page likes, post likes, comments, shares, and other engagement metrics on Facebook.

When selecting an SMM panel for Facebook, consider the following factors:

- Reputation and Reviews: Research the reputation of the SMM panel by reading reviews and testimonials from other users. Look for feedback on service quality, delivery speed, customer support, and overall satisfaction.

- Service Quality: Evaluate the quality of engagement provided by the SMM panel. Look for real and authentic engagement from active Facebook users to ensure that it aligns with your goals.

- Pricing and Packages: Compare the pricing and service packages offered by different SMM panels. Consider the value for money and whether they offer the specific services you require for your Facebook marketing strategy.

- Customer Support: Assess the availability and responsiveness of customer support. A reliable SMM panel should have multiple channels of communication and provide prompt assistance.

- Security and Privacy: Check if the SMM panel has transparent policies regarding data protection and privacy. Look for indications of secure payment options and measures to protect your personal information.

It's important to note that while SMM panels can provide initial engagement for your Facebook page or posts, building an organic and engaged audience through valuable content, regular interaction, and authentic connections is crucial for long-term success on Facebook. Additionally, be aware of Facebook's guidelines and policies to ensure that your marketing practices comply with their rules and regulations.