I think you can deduct the reg fees of all the domains that you own. Because you might have taken them for earning more money and business development is not a crime
You can also deduct hosting fees.
You can also deduct the computer and internet bills. Hardware upgrades, software purchases and even money that has been spent on the development of that sites or used to get the content written for those websites.
Don't know what are the rules in your country but atleast there is one global rule that expenses does gets deducted out of gross income.
Thanks.
