1) The reason for having @ in email addresses is to prevent collisions and identify stuff like who you work for. Between billg@microsoft.com and billg@gmail.com you know which one is the real Bill. Once you give everyone on the planet who uses email a twitter account the name collisions will be horrendous.
2) You're giving twitter a monopoly on the most ubiquitous communication method on the internet. What happens if they delete your account and ban you? What happens if they put something too evil for you in their TOS? You just cut yourself off from communication?
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Ok so..
1) The reason for having @ in email addresses is to prevent collisions and identify stuff like who you work for. Between billg@microsoft.com and billg@gmail.com you know which one is the real Bill. Once you give everyone on the planet who uses email a twitter account the name collisions will be horrendous.
2) You're giving twitter a monopoly on the most ubiquitous communication method on the internet. What happens if they delete your account and ban you? What happens if they put something too evil for you in their TOS? You just cut yourself off from communication?
3) .. I could go on