FriendFeed has none of the issues and does not have the critical mass to draw the sort of high-profile attention the defacers were seeking. Given enough scale, FriendFeed will have its share of issues.

I can believe the "True geometric growth is hard to deal with period." argument when it comes to downtime.

But what does scale have to do with security?

More users -> more attackers -> more holes found.

Attackers can only find holes that are there to begin with.

There are always holes.

Some architectures are more resistant than others. I suppose you could break into some air gapped military computers -- if you had a nuke.

why are we even discussing this?

Or someone on your payroll on the inside.

Well that's universal. You can't exactly protect against someone who's also supposed to hold the keys to the system. Its more a feature than a bug.

It's like saying Macs don't have a virus problem.