How do you play a friendly game of tag with respect online? It is easy, tag correctly. And in that, tag people that are in the photo and not people you want to have see the photo. That goes against what tagging is supposed to be.
Tag people that are in a photo. Stay away from tagging people that might be nearby and are not directly in it. A photo that is tagged with truth shows up with more authority over those that are just being tagged to spam market.
How do you play a friendly game of tag?
Also, consider asking people before tagging them. When you add a tag and someone removes it, says it is spam or reports it, that hurts the pictures optimization, your authority and your page as a whole.
Some people might not want to be tagged or might prefer a more private vibe online. Consider that before you are seen as using them to promote. Considering how others might have been tagged before and how they might feel about it before you decide to do it shows a respect and a professionalism that many others skip on.