I enjoy seeing what my friends and family are up to, including the minutiae that might not otherwise come up in conversation. In participating, I also have an easy history of the things I've done to look back over. My wife loves TimeHop reminding her, via social updates, what she was doing on the same day a year ago. "Remember this?" Cue much reminiscing.
Further to that, all social sharing serves as developing a personal brand and there are social and commercial advantages to that whether all doing it realise or not.
"Paint a picture of it."
I almost laughed at this bit. Why not allow even more time for contemplative thought by first creating inks from scratch, using ingredients relevant to the original experience and naming each combination of colours to evoke just the right memories?