Usually someone who writes on a blog that isn't theirs is called a contributor or a guest blogger.
Add a link to their blog from your blog.
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It is and isn't possible for someone to infect your blog with a virus. It is possible if they know how to edit your blog, using your username and password, so they could just imbed a virus to the webpage, but it isn't possible unless they can directly edit your blog.
That is the bad part cause the same thing happened to me!!! OK. If someone steals the name of your blog, then go to the police and tell them what happened or you can sue the person that stole your blog name.
The best way to gain money with a blog is to place ads. Every time someone clicks on an ad the owner of the blog will recieve money. One company which is offering these ads is Google Adsense.
No.
The best way to come up with a name for a blog is to be creative with the subject matter of your blog. If you have no ideas you should hold off on naming your blog until you do.
A blog (with privacy settings)
You can use blog statistic tools to find out who has been visiting your blog, what key words they are using to see your blog, what pages and post they are looking at and how long they are on your blog. The number of visits that appear on your stats is the amount of times someone have entered your blog.
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One can find something about bird netting on the "birdbgone" blog. This blog contains information about how to use bird netting and also what effects it can have. The website contains user commentary as well which contributes to the blog.
"Joining" someone else's blog requires them to let other authors post their articles on his blog in the first place. Unless you mean "joining" a blog like "joining" a site as a member, which I don't think is possible.