How secure are your online accounts really?

I read an article over on Associated Press entitled AP Exclusive: Network error causes scary web error

The run down of the article is, Three people trying to access their Facebook profiles via their Nokia mobile phone ended up in three separate accounts that were not theirs.

They were not asked for login information of any kind, the fault was blamed on the AT&T network. However I find this to be of extreme concern.

For starters, why was their no Login prompt. Is this due to network operators caching data on their own servers. Which brings me to my concern, How many ISP’s are caching data that maybe they shouldn’t be.

Along with that, who else is viewing such cached data. I don’t want to get into a conspiracy theory debate but it does make me wonder just how secure our online accounts are and how often things like this happen and go un-reported.

How concerned are you about your accounts being viewed by other people even if by accident. After reading this I am mildly concerned but then I don’t publish too much personal information for such a reason