This is true.  I was referring more to non-social-network web apps, like going between Google Docs and ZoHo, or switching version control hosts.  There's typically a loss of <i>some</i> data there, but the really important stuff (raw content) can be pulled out and transferred with minimal effort.<p>Social networks are about the opposite, as a lot of the content isn't really "yours", it's a result of interaction.  I made no reference to this in my comment though, so thanks for pointing it out :)