Where is Boris's 100,000 strong Twitter Army?

I ask the question after reading this interesting interview on the Standard website. In the interview given to Pippa Crerar  Boris's campaign manager Lynton Crosby states:

"This time the huge supporters’ army, which has swelled to more than 100,000, is key. Each of the “captains” runs 25 other volunteers, leafleting, door-knocking and tweeting in support of the Mayor. There are tens of thousands more supporters online."

I'd like to ask where are these supporters because they're not tweeting that often if there are a 10's of thousands? Perhaps the definition of "supporter" is being rather stretched here perhaps it's a facebook like or an old email address given in 2007. I understand there's an election on but the evidence really doesn't support the claim.

Another interesting point Crosby made that the campaign has 347 "ward" captains these must be bigger than the normal wards in London local government or they're only targeting some areas as there are alot more wards in London than that.

In other news I've found the twitter account of the UKIP candidate. Which is handy as polling will commence shortly.