Private message limit?

I’m looking to PM people with my 10 accounts. I can scrape targeted users by page post likes, and put them into a list. How many people do you think I can PM in a day without getting blocked? Accounts are 6 months old, have pics, and phone verified.

Can I pm them the link to my website’s squeeze page, or should I make a post on my FB page which links to my page? I’m thinking that if you PM too many outside links you will get blocked easier?

What are your experiences guys?