I hate to be a pessimist but it's gonna be damn near impossible. It's like knowing a band door a few promo pics as opposed to songs and band name (trust me I speak from experience).
I'd say your best bet is to try googling a commentaar they left? If u remember any of them. It would probably have to be word for word though. of if they were on an unpopular club u can go there and try to find them. Other than that I don't really know of a way.
u can't A person's ign is their calling card if u can't figure that out. u can't figure out which gebruikersnaam your friend has. It's like going into a neighborhood and forgetting what address your friend has. No identification no pinpoint shot to finding zei friend..
