It would seem to me somewhat difficult to launch 10,000 lawsuits unless you had endless amounts of money. In Lord McAlpine's case, I think he was asking for apologies from the tweeters.
In that case, would you insist on production orders for each of the 10,000 against whom a case was being brought? Do you deal with his legal team? It will be somewhat precedent-setting if this kind of case goes forward.