[bousaid]

Wow. What sort of data do they send?

[omnimus]

This varies in strange ways. I dont know how facebook does this and if i could get more but i have seen facebook datasets from three people including mine.

Usualy it is all photos and vids yove uploaded, comments etc.

Mine was most complete. Including some sort of keywords tags i am interested in. Not things i followed but what fb thinks i like.

Other datasets did not include this but one included all the times someone connected to the account including IP and location.

[SaturateDK]

You can do this with phone companies in Denmark, and you'll get your location history. As they are required to keep that.