Have you noted MWT has nearly 29000 followers on Twitter but if you look back at his tweets he only version gets a handful of replies and 20 or 30 likes max even on his big breaking news stories, so why is that?
Let's look at 1% interacting? Not a lot is it so giving him 290 replies/ like, he is not getting half a percent or a quarter or an eighth of one percent so why is that you may ask yourself as the high profile finder of dirty buggers.
I have found out the man has been buying followers to increase his reputation and make him look more credible, yes folks it's true.
I never knew you could do this but it turns out you van buy a thousand followers after just a few quid. my flabber is garsted.

Your observations are correct in would say and he quite possibly has a few thousand genuine followers on Twitter.
By the way you can buy Likes as well MWTW maybe good for you to toodle off and get some ha ha ha
Only joking..... like

He is back tweeting again at a wikileaks conference

Here is the link so let's see how many likes retweets and comments he gets