I wanted to try Pinterest but after I got the invite I found I had to sign up with either Twitter or Facebook. Not for me. I then heard about Pinspire, who let

I wanted to try Pinterest but after I got the invite I found I had to sign up with either Twitter or Facebook. Not for me. I then heard about Pinspire, who let you create a seperate log-in. So I signed up. If you want to fend off imitators you need to remove usage barriers.