Ah, just read the terms of joining and noticed that you can load a max of 10 shots a day and hold a max of 2000 on a free account. so much better than flickr in some respects.
I'm just not sure any of my shots are worthy of being on 500px
I got a notification the other day that someone had added one of my pictures as a 'favorite', which was flattering.
However, when I went to look at this persons pics, they haven't uploaded any pics but have over 330+ pages of 'favorites'. It seems an unusual thing to do to have about 4000+ 'favorites'.