All links should be blocked IMHO. If you have something to say (in 280 characters) say it. If you have more to say, I'll find it on your blog.
Technically it doesn't solve the scam problem though:
"I'm definitely the real Elon Musk. No question about it. Click the link in my bio to get 40 ETH, but you need to send me 20 ETH first so that I can verify things."