The Times has a two page piece today, by the above, on the rise of anti-Semitism in the UK.
He puts this down to two things - 9/11, and the development of social media and electronic correspondence. We could say rather similar things about the development of conspiracy theory, although as with anti-Semitism, these are phenomena that long pre-date the latest gadget or terrorist outrage.
Of 9/11, Finklestein comments:
When baffling events happen, planes coming out of a clear blue New York sky, people look for an explanation, a wrong that can be righted, an appeal that can be made to reason. And very often in history, the answer involves doing something about the Jews.
I have not yet read a substantial analysis of contemporary British Islamic anti-Semitism. But when one is written, I suspect it will begin with a very similar starting point to Finkelstein's post 9/11 analysis.