There even is a second vandal posting "in my name": 
http://ws.arin.net/cgi-bin/whois.pl in this case gives 
OrgName:    ThePlanet.com Internet Services, Inc. 
OrgID:      TPCM
Address:    1333 North Stemmons Freeway
Address:    Suite 110
City:       Dallas
StateProv:  TX
PostalCode: 75207
Country:    US
As this was given as the reason for my block  I protest it. I also protest the admin not checking who posts at his page, although I admit I would not have thought of the possibility someone doing something that stupid either.