I've done that. They pop up like hydra heads. The point isn't right to delete. The point is right to not have my personal info plastered all over the internet without me having to contact each site and say "plz stop" and for them to say "OK we'll do it in 7-10 business days"
You'd be considered lucky if you can even find an email address. I had some of my personal info crop up on Google searches on Fedora mailing lists, I've emailed various people at Fedora to get them delete my old messages or redact them, but never received a response. :(