I was looking up Pulp on Twitter and as well as coming across NotJarvisCocker, I came across a tweeter with the name @Markwebstar, which was the name Mark used to use when he posted on Frameworks archive. I'm not 100% certain it's him, but he is following @Pulp2011 and he's London based so it's possible . He hasn't started tweeting yet, so maybe if you guys follow him he may have an incentive to do so. (I'm the only one so far)
Rumour has it today that @NotJarvisCocker is actually Jarvis Cocker but I'm yet to fully believe it! Lauren Laverne had mentions it was him and to a lot of people that seems to be enough conclusive proof!