Facebook Friend Adding Question

I hate using facebook.

But let's face it you need to if you want to keep up in the IM game. I have a huge list of scraped emails from FB that I used awhile back for other purposes. Now if I take those and make a bunch of accounts and add 500-1000 people in the fresh accounts what red flags will this raise?

I know there was a thread saying you can make pretty much unlimited accounts per ip address but what are the limits to uploading text files chuck full of "friend" emails?

I've heard people say they invite anything like 5,000 but hey thats way too much. They say around 40 is the golden amount of adding individually.

But i think email invite is different. Not too sure.