I'm genuinely curious from an ideological perspective, why archivists think all this material is worth saving? People often compare the shutting down of sites or the banning of content (e.g. When Tumblr banned porn, or now yahoo shutting down groups) to the burning of the Library of Alexandria. But there is a huge difference. The LoA held knowledge collated and collected by the best thinkers of the time. The Internet…
A main concern of the Archive Group (again, below) is art that was uploaded there.
I'm sure those are not the only two classes of examples. See for example the bird watching group in Delhi that has been collecting data for decades. (In the link of the OP.)