Here is how much you get from visiting those sites:
0.0050BTC http://freebitcoins.appspot.com
0.0001BTC http://oscry.com
0.0001BTC http://dailybitcoins.org
0.0001BTC http://www.coinad.com
That's a total of 0.0053BTC or $0.05. Sorry, it wasn't worth a nickel to visit those sites, especially because you can't do anything with only 0.0053BTC. Anyway, if someone wants get some free BTC, albeit a trivial amount, they should only go to http://freebitcoins.appspot.com (and directly from this link). It is not an ad site like the others whose payouts are comparatively insignificant.
Ya, one needs watch out what links they click, on this forum or anywhere. I avoid anything that doesn't look like it goes
directly to the desired site and instead goes to some reddit page or is hidden behind some coinurl or other redirection thing...
About the trivial amount thing you mention... well no one, I hope, is suggesting that this is a viable source of income which
will allow one to give up their regular job.
( then again, who knows what 0.0053 BTC might be worth several years from now. )
When I first found out about Bitcoin I wanted to try it out as soon as possible; I am sure many other newbies are the same.
Signing up to some exchange or using some of the other methods for buying bitcoins can be a hassle, and can have fees higher
than someone just wanting to try things out would like.
So using these few free bitcoins sites can be a good way of trying things out... it is exciting to get that first payment to ones
wallet... and if other newbies are like me they will be just as excited to gather enough together to send them off to a friend
or a worthy charity or the like, in order to try sending as well as receiving.
And getting new users excited about Bitcoin and getting them using it right away can only be good for Bitcoin as a whole.
That is why I maintain the [somewhat] official list of free bitcoin sites ( which maybe deserves a sticky all its own instead
of being buried inside the "New to BitCoin? Start here!" sticky, since it seems every few days someone else decides to start
up their own list of free bitcoin sites, and often they contain entries of a dubious nature ).