you will surely penalized by Google panda, If you are adding profile pages into sitemap, and you also be penalize by Google Penguin if you have no control on outbound links. So Don't forgot to learn about nofollow attributes.
In my real advice, Don't add every profile url into sitemap, simple disallow your /profile directory from robots.txt
Just look out facebook.com/robots.txt there are many things are blocked from spider, and hence Google will not index all the items, also Google will not crawl that page directly from Facebook.
Now suppose user linked the Facebook profile on own site, Then Google will crawl that page from user site, not from Facebook site, because it is blocked by Facebook robots.txt. Now in reality Facebook blocking profile page to index, But some of people mention Facebook profile on web pages, hence Google index that pages on search result. Just look out Facebook Home Pagerank, It is 9 and just look out someone profile pagerank is 0. I hope you got it me.