[StavrosK]

> and that I've logged in to them from the same machine

Wouldn't that be a dead giveaway?

[teraflop]

If you can't log into Facebook from a public/shared computer without them disclosing your relationships to everyone else who uses that computer, they should make that very very clear.

[gertef]

They absolutely use geo-ip correlations, and it is a problem.

[rubinelli]

> the "fake" e-mail address is a "[e-mail]" address

If not the machine, then surely this.