Good old Scribophile. After Posterous kicked the bucket and I was searching for an alternate, I joined Scribophile. However, it was not Posterous and did not fit in with how I like to do stuff, so, although I am still a member I do not do anything there.

Luckily my partner happened upon Medium and I joined it, though not perfect, lots of warts etc. It works better for me than Scribophile. I must say I found the folk there very pleasant.