Tumblr is an excellent blogging site. I've had no problem with it. However, like all social networking sites, there can be people who steal information or offsite links that have viruses.
The ads used to have viruses, so be careful. Otherwise, it's great.
Apple.com is the website of the electronics company Apple. Completely safe :-)
This site is really funny and awesome, but the ads can tend to be a little bad. Be careful.
Awesome site :-)