Hmmm, well what I'd find more interesting is the number of people who have gotten away with bragging about crimes and such over Facebook, rather than the ones that have done it and gotten caught. Trends like this start for a reason.
Also the law can be a messed up thing, and depending on the details and the lawyers some of these arrests might not lead to convictions. See, if you can goad the police into arresting you and pursueing a case you know you can beat, even if on a technicality, it makes it much easier to beat other cases by claiming that the police are harassing you on a grudge. Looking at the guy who posted the picture to the Kid's facebook page and such, I don't see much there that is inherantly incriminating, unless the coat is a one of a kind original or something that picture could have been taken anywhere, it's circumstantial, and Facebook is fairly easy to break into and impersonate someone else with as far as such things go. As I said, we'd have to know more about the way these cases have been fought in court before making any desicians on stupidity.
Believe it or not there are fairly petty criminals out there that are more or less untouchable due to the sheer number of arrests they have had without conviction. They can scream police harassment/racism and point to the record and use it as a form of defense, because anything short of an airtight case could get the police sued... and the funny thing about airtight cases, is that in a country (the US) where the requirement is "beyond a reasonable doubt" there is vitually no such thing when someone has a big enough microscope. That "harassment" record becomes the very definition of reasonable doubt.
As far as the lady selling the kid, that's messed up, but the devil is in the details. Definatly illegal and should be, especially given the attitude over facebook, but it's remotely possible she couldn't raise the kid and was trying to find a new home. 15k for a baby isn't surprising given that the mother can't/doesn't want to raise it, it's not a surrogacy arrangement which is a bit differant.
The reason why I think this one needs to be looked into is because I figure the really evil people wanting to sell their kids would have done it internationally. The "usual" method is to take the kid, anything from an infant to a teenager, on a vacation to Asia... Bangkok is a pretty typical location "we're going to see the temples and learn about Thai silk making!", have the kid "abducted" in exchange for money, and then sit there and wallow in the sympathy "oh noes! they took my child" while spending your money and heading home to "greive". Then the organized crime syndicates sell the kid (or just the organs) or
put them to work in the sex trade. It winds up falling under "disapperances" and the blanket warning about how some parts of the world are fairly dangerous.
If she was seedily shopping around to sell a baby for some fast cash, this actually makes me think she was thinking in terms of finding it a home, from someone who couldn't adopt due to his own record (there is always a reason). As opposed to the kid say being chopped up for organs to save the life of some rich guy's baby who is born needing a transplant or whatever.