44% of people who follow the @Facebook account on Twitter are — well, actually, they aren’t, according to an entertaining new app that checks out how many fakers you have in your following. The main @Twitter account doesn’t fare that much better; exactly a third of its followers are very likely spam bots.

Now there’s an online tool, created by London-based social media management firm StatusPeople, that sifts a sample of those who follow your Twitter handle for fake and inactive followers.

StatusPeople tool is constantly refining its sample for each account. But it is clear that large chunks of the following for major corporate accounts are fake. @Google and @YouTube, for example, are both in the 33% fake range.  Defining a fake or spam account isn’t an exact science, but here’s the guiding principle for StatusPeople’s algorithm: “Spam accounts tend to have few or no followers and few or no tweets,” the company writes. “But they tend to follow a lot of other accounts.”