It already does this, and it doesnt seem to be much of a problem as long as you ignore this. I also think that FB is different from myspace, as it is slightly easier to move around and view things, and has a generally more open atmosphere on the opening pages, but that is just me.

And for viruses, as long as you never click the accept link, I haven't had any problems, and theyre pretty easy to spot in messages:
"Hey dude, check out this awesome..." (you get the point).