Memo spam!

Hey @ned can we do something about this spam? Every couple of days I'm receiving memos from @merlin7, @minnowbooster and other scam websites. I respect that the urls are not clickable, but with this much spam I actually fell for one and tried it out, and guess what? I basically got ripped off. :| Make the memo 100 - 200 characters or add a show memo button on the UI.