Leave no comments other than “I don’t get it” or “Haters gonna hate”.
Always “Like” only the sad depressing status updates like “ I never thought i could feel so much pain inside.” You can excuse yourself by saying you are such a deep person and understand them.
Search for a random irrelevant picture from people’s albums, leave long intricate comments like “See, sometimes people really are just in denial, now that i see this photo i realize what was going on all the time, i knew it…”. Refuse to answer any questions they have.
When someone posts a depressive status comment about how happy you are that the event occurred, when the next person starts cursing at you and calling you all sorts of things delete your first comment, that way it will seem like the second person was cursing at the status owner all along, end result: “My dog died today.” – “Shut the hell up you asshole!”. Eat popcorn.
Post nonsensical cryptic lines onto peoples walls. Also imply their involvement in illegal activities for maximum effect.