Wow. I found this rather poignant. I've been on Facebook for 6 years, and it struck me that most of the events it picked out were closer to the start of those 6 years than the present.
I found it funny, because of the mismatch between the "this is supposed to feel poignant" style of background music and the completely-lacking-in-poignancy material I tend to post on Facebook.
I definitely found it the reverse. I've been using FB for 8 years and I found it very poignant too but most of the images seemed to be from the last year or two.
I don't know if this correlates with the amount I posted those years or is just the effect of randomly picking a fairly small pool of images and events. http://en.wikipedia.org/wiki/Clustering_illusion
Maybe you (and your friends) used Facebook a lot more 6 years ago. I'm sure that's a big part of the algorithm: picking out the posts that got the most interaction.
