b2d151 here
I don't know to be honest anon. I suppose that some unique ID of the phone could be used in the generation of a UUID .. IMEI, WLAN MAC, SIM etc. There are alot of Q pics posted with UUIDs as the filenames, to be honest, a conversation just like this is where I learnt about them. There are also alot of people that use them posting images to this board - I imagine this is an anonymity thing. If a Q pic doesn't have a UUID filename I pay more attention. However, I am not saying it doesn't have significance - it may very have - a bit like the DOITQ twitter filename.