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Scoble, a former , was previously auto-following every user that followed him, which led to him following 106,000 people.

However some of the users he followed were spam accounts that filled DM inbox with junk. He also said it was impossible to read every tweet from over 100,000 people.

Scoble yesterday explained the situation on his : "On Monday I unfollowed 106,000 people on Twitter. The reaction so far has been quite interesting.

"More than 7,000 accounts have unfollowed me back. They did that so fast that I assume they are just bots that are looking to increase their follower numbers.

"I knew I'd lose them, but that's sort of why I did it. People who are following me just to get another count on their follower numbers are just plain, well, lame.

"But it's worse than that. When I unfollowed everyone all my spam just stopped. Dead. No more spam. Not since Monday.

"Twitter is actually quite enjoyable. Not a single DM spam. Not a single piece of spam has come through the home page."

Twitter users are not able to mass unfollow natively, so Scoble had an automated script written by that did it for him.

Scoble is now following 1700 people that he said he personally cares about, as well as "smart" people that he can learn from. He says the spam has ceased.

The blogger has devised a set of criteria about "what makes a 'followable' person".

His list is as follows:

1. I'm more likely to follow you if you have a well targeted Twitter profile. If you say "fun guy," sorry, no. But if you say "engineer at Yahoo working on Flickr." Well, then, I'll be much more likely to follow you. Now, take it out of geek ville. Let's say I was looking for quilters to follow. Well, then, I'll be biased toward people who identify what kind of quilting they do.
2. No picture, no follow. For a brand like BestBuy you better have a logo. Out of 1,600 follows I've done this week, I've only broken that rule a few times and even when I broke this rule it made me think very long and hard about whether following them is worth it.
3. I'm biased toward following people who DO things in real life. Entrepreneurs. Politicians. Actors. VCs. My list, which you can check yourself, is biased heavily toward people who've made something of themselves.
4. If tons of the people I trust (you know I trust them, because I've followed them) recommend you, I'll add you too. So, repetition is important.
5. I look at who YOU follow. Do you follow lots of other geeks and people I like to follow? Then you're more likely to get me to follow you too.
6. If someone smart keeps retweeting you (like how Dave Winer keeps talking about Jay Rosen) then I'll follow you too.
7. If you're a news maker. Hey, I follow Barack Obama. Why? Well, he makes news. Among other things. Same reason why I follow TechCrunch.
8. If you're powerful, I'll follow you. I follow both powerful bloggers like Ariana Huffington as well as powerful VCs like Jeff Clavier and powerful executives like Marc Benioff. They probably all will laugh that I called them powerful, but they are.
9. Do you have a brand I like? I notice that I'm adding more and more brands I like like Zoho and Evernote and others. But if they abuse that position I'll unfollow them first.
10. I look at your last 20 tweets. If you are just talking about your lunch, I probably won't follow you. But if you're talking about a project you're working on and it sounds interesting I'll follow you.
11. If I've met you face-to-face I'm much more likely to follow you. In fact I've scanned all my business cards in, thanks to Cloud Contact's great service, and I'm now matching those up their Twitter accounts and adding them too.