I was trying to develop a site where every member can put his profile with his photo too.

My preview is that the site could achieved 200 000 users. So the question is:

should I store the 200 000 photos in a folder or in blobs?
mysql isn't strong enough for that? if that the case, the solution should be trying an commercial database like Oracle?

And in cases like sites that store millions of users like 3 million?

can anyone help me in this issue?