The thing about the internet is that people use it to air extremes of view and experience, or to talk about stories of extreme experiences.
So tripadvisor is full of reviews from people who either loved or hated the hotel they stayed at and not many from people who thought it was ok but nothing special.
Similarly, people who have had horrific experiences with social services post about those experiences. People who have had brief encounters with social services that all turned out ok in the end tend not to post about them.
That is not to say that social services never get it wrong. I know someone (know them personally and know exactly what happened - this isn't "friend of a friend of a friend stuff") who had social services threatening to remove their children due to a huge misunderstanding about a medical situation. It was the most surreal, nightmarish situation because it seemed that every time they produced evidence, the SW involved would imediately move the goalpoasts, and every time they agreed to something the SW wanted, she would turn round and say "actually, that's still not going to be enough". It was completely incomprehensible. They finished up leaving the country and going home - they were from another EU country whose social services equivalent have assessed them and discharged them with no concerns whatsoever.
But set against that, I know (through work) of a vast number of families who have had social services involvement that was entirely right and proper and resolved in the appropriate manner. But you don't hear about those. People don't come on the internet and say "actually, my children weren't being looked after properly because I was drinking a bit too much, or involved with someone violent. Social services made me sort myself out and now things are better."
And unfortunately, an awful lot of people post social services horror stories on places like MN, and they simply aren't true. Even if a social worker gets it wrong, they still have to go through the proper channels to get it wrong. They can't just walk into a house, pick up a baby and walk back into their office and say "look at this nice adoptable baby I stole today". There has to be a court order or a PPO. There will be paperwork. There will be other people involved. If someone comes on MN with a story about a rogue SW strolling into their house and removing their baby with no warning or explanation then they simply aren't telling the truth, I'm afraid.
What also rings alarm bells is when they then claim that no-one is doing anything at all - their solicitor seems powerless, the court doesn't seem inclined to have a hearing, social services won't give them any information etc. The amount of work involved in removing a child from its birth family is huge. There are vast quantities of paperwork, multiple professionals involved, all sorts of court reports and witness statements. Social workers can't just take children away because they feel like it.
And you also have to remember that the confidentiality issue involved in these proceedings means that the Daily Mail isn't actually invited to the court hearing to see why a child is being removed - it is going on what it is told, generally by people who have a pretty vested interest in their version of events being put forward.
Social services sometimes get it wrong. But there are all sorts of safeguards in the legal system to make sure that those mistakes are rectified. The cases where the mistake gets carried through and manages to get past the court/lawyers/cafcass have to be vanishingly small, but account for a very large proportion of the stuff that is posted on the internet.