I mates ! I bought a new domain 2 months ago but i still don't know what I should do with it (lol), so i just posted a message with "This website is under construction". After the last PR update, I've been shocked: my domain had PR 3 ! The funny thing is that my other websites got PR 2 only after I worked hardly to promote them... Did this happened to you too ? Why is this happening ?
I guess the domain name expired or deleted recently the time you registered and still it's getting quality backlinks.