Exactly. It seems to me that there's evidence of Sollecito writing things on that private FB group which were immature, inappropriate and idiotic. He really ought to know that he's still in the spotlight to some extent (albeit from pro-guilt obsessives who creepily follow his every move, rather than the general public or even the World/Italian media - though this latest story came to life courtesy of an agenda-blogger who, seeing that Sollecito was involved, passed the story to a magazine).
But Vixen wrote very specific and extreme claims, among which were the accusations that Sollecito was writing "disgusting misogynist filth", and - far worse in the context of the Kercher murder in particular - that he had written about "how he had got away with it (i.e. the Kercher murder)" and that he was "using (Kercher's) name to make the crudest suggestions on how to hide a body or cut it up". It was these types of extreme, inflammatory and explicit claims that I wanted evidence of - I already knew that Sollecito had been discovered writing stupid, immature stuff in a lame attempt at "humour".
And it transpires, apparently, that Vixen cannot provide any proof to back up her accusations. Which leads to the conclusion that Vixen took a story and then added her own agenda-led magnification and exaggeration to make it far, far more than it ever was. Who'd a thought it......?