Everybody seems to be on facebook nowadays. After a few friends added me on Facebook, I finally found some time to register. For these kind of sites I use a special crafted email address, i.e. something like marco+sitename@mydomain, and I registered successfully, for example, on Spock and Linkedin.
Big surprise: Facebook returned me an error, saying that my email is not valid.
That’s a serious error, for a big site like Facebook. Quoting RFC 3696:
[…] Forms such as
user+mailbox@example.com
customer/department=shipping@example.com
$A12345@example.com
!def!xyz%abc@example.com
_somename@example.com
are valid and are seen fairly regularly […]

![Validate my Atom 1.0 feed [Valid Atom 1.0]](/images/valid-atom.png)

