I sided with the PCC argument that the Tweets were in a public environment, but sided with the complainant that the reporting of them was unjust.
Sadly, that second bit is not what she seemed to have complained about, which was a bit silly IMHO.
As for the Private Eye, while they do maintain a very good database (hmm, open data?), I find their rather smug attitude to reporting other people's mistakes and glossing over their own regular errors a bit irritating.
Ultimately though, the only way to stop the tabloids behaving the way they do is for people to choose not to read such material in the first place and take their custom elsewhere.
I doubt a tabloid editor is going to care all that much about what The Guardian write about them - as none of their readers will have bothered to read up on it either.