Been thinking about this and keen to see what others think.
Ex-partners - When you split, do you remove all trace of them off social media? Like when you had a day out at the coast and tagged them in with selfies, or when you posted a loving birthday message with hearts while at a romantic view
New partners - When do you become FB friends and allow them into your life, seeing your friends and contacts etc..
For me, I removed all trace of my wife after our split due to us having a pretty bad relationship post split (now, very amicable). Also, I did think about the message it sends when I met someone and they see so many old posts.
Likewise it did annoy me my now ex-gf had quite a few pics of her ex on there as it just seemed weird there was more of him than of me, maybe thats because she eventually admitted she still had feelings for him.
In terms of new partners, I was with someone for 2 months and no becoming FB friends, yet was with my ex gf for about a week (or less) before doing that (although we know a lot of the same people).