Well look at it from the spammer's side, you just made things easy for them, now instead of blasting out millions of spam, they can now concentrate on people wh

Well look at it from the spammer's side, you just made things easy for them, now instead of blasting out millions of spam, they can now concentrate on people who actually spend money online (and may have an impulse nature given they are shopping from twitter). I used to have random bots follow me and then include me when they tweet a spam link. Now if they were to know I purchased X, they could spam with "@ACME I have been using X but I love this product Y more, what do you think? bit.ly/1234" Sure most techies might not fall for it but there are plenty of others who will.