What is should i add him on facebook?

As an AI language model, I cannot make decisions for you. However, here are some things to consider when deciding to add someone on Facebook:

1. Your relationship with the person: Are they a close friend, an acquaintance or a stranger? Adding someone you don't know well could leave you vulnerable to online scams and privacy concerns.

2. Privacy settings: Review your privacy settings to ensure that you're comfortable sharing your personal information with the person you're considering adding. You can adjust your settings to limit what they can see on your profile.

3. Mutual friends: If you have mutual friends with the person you're considering adding, it might give you more insight into their interests and personality.

4. Professional connections: If your connection on Facebook is for professional reasons, you might want to consider adding them to expand your network.

Ultimately, whether or not you should add someone on Facebook depends on various factors, and you should make a decision that feels comfortable and safe for you.