I've been a member of the Facebook community since around 2006, so I've been around a decent enough length of time to notice changes in the hottest, most "socially acceptable" way to use it.
1. In the beginning, Facebook was, understandably, super simple.
Make sure to add anyone you even vaguely recognize. Spam each other's WALL (not Timeline--I miss the wall!) with conversation bits.
2. Play all the Facebook games and spam invite your friends (e.g. Candy Crush, Farmville, Restaurant City, Mafia Wars, etc.).
3. Compose a bunch of notes for people to lurk (optional: and comment on). Make quizzes to see how good your friends are at being friends.
4. Post huge albums of your trips and every artifact/historical site/interesting looking structure you encounter. Bonus points for artistic profile pic selfies with a meaningful song lyric
5. Join all the groups. Like all the things.
6. Do all the quizzes to find out the colour/animal/Disney princess/food/article of clothing you are; this will greatly enhance your self-awareness.
7. Delete a few people from your friends list (most of whose profile pics have gone dark because they're inactive anyway) then post a deliberate status about how you're cleaning out the toxicity from your life and "if you're reading this, you have the honour of remaining my friend". Congratulations!
8. Post videos/links and tag all your close friends in it in order to guarantee a response so it doesn't look like you're talking to yourself.
9. Join none of the groups. Like/comment on nothing. After all, "I don't do groups".
10. Profile picture filters/alterations to show that you're aware of global issues and this is the extent to which you can be bothered to get involved.
11. Tag friends in memes and "stupid but relatable" inside jokes because you don't want that garbage on your wall but you still want people on Facebook to see that you're cool enough to use Facebook just not with them.
12. Post meaningful articles and links to demonstrate your responsible citizenship--while inadvertently provoking an uncomfortable public disagreement in the comment thread between two of your friends that don't know each other and come from distinct parts of your life that you had previously hoped to keep separate.
We've sure come a long way.
