I won't use it. Life isn't meant to be traveled backwards, it all happened for a reason including the bittersweet one. I'll let the future can't be predicted, to motivate myself positively. Our present is a gift, let's unwrap it and be grateful for what is in it.
Yes, I actually do. It was something relating to the New Years, and I asked some deep question about "meeting a younger version of yourself". If I recall correctly, not many people replied to it, though.
Still, it was very awesome. I remember saving my first topic to be on that day, January 1st of this year... since it'd be like "1st day of 2018, 1st ever topic post".