Farcebook has it's positive aspects and is quite functional if one understands how to ignore eegits, filter out the general jibberish and dross application such as the Crapville genre etc.
Remember Farcebook only exists to lure and hook people into parting with real currency in exchange for virtual property, like a strippy green coo for your virtual farmyard. In addition, to generate masses of advertising revenue for the owners. After all, it is a profit making business concern behind all the fluff and eye candy.
Also, this application also databases a wealth of personal information, basically everything that is input.
Shameless employers and surreptitious governmental organisations [councils / polis / you name it] are spending increasing amounts of time trawling Facebook and other online sources, data mining.
Simple, they engage in this form of surrviellance in the hope that less than surreptitious employees / claimants can be caught with their knickers doon, in a manner of speaking.
As an example, if yer claiming the JSA, Hoosing Benefit, Cooncil Tax and Disabilty Benefits, dinnea go posting piccies of yer £25 000 luxury cruise, golfing and skiing holiday on Farcebook. Oh it happens, blatant eejitery knows of no bounds.
Twatter is simply glorified IM's, IM's have been around for as long as the internet, it's nothing new. There is bugger awe there to get intae a lather aboot.
Aye, not everyone that uses these apps are utter drongos. However, that is not to say some are not. Bottom line:-
These apps are free (at source) to use. However, if you don't like them, have concerns, you know the drill. El rampant digitus!
Also, these and their clones have privacy and security concerns. It is paradoxical in that the more complex these appications become the more weaknesses they present to be exploited.
In conclusion, I would never trust Farcebook or Twatter to be secure with any personal data. The pages ain't even HTTPS protocol.
You don't have to be completely paraniod, just informed and cyber savvy!