Eu, hein... Que coisa estranha! O Fluidr pelo menos tem um about:
Who's behind all this?
Fluidr is a hobby project of Sidath Senanayake (haelio on Flickr) and was initially developed as a way to share photos with friends and family without them having to wait for page loads each time they moved from one large-size image to the next. They soon found that they would get a lot further into a photostream before moving onto something else when they used early versions of Fluidr.
Parece ser uma carinha melhor pro Flickr (Não que eu ache que precisa).
Agora, esse Submity... me pareceu completamente opaco. Não tem um about, uma página de contato, nada. Muito suspeito mesmo.