Is yahoo answers entering the event horizon of a black hole?

It is unlikely to be lost. Storage is cheap these days. All the answers entered into YA are a time capsule of early twenty first century life. They are an index to our culture, our needs, wants, experiences and fantasies. If preserved, future generations of sociologists and psychologists can mine the data to determine what made us tick over the last twenty years. There are potentially papers to be published and PhDs to earn based on the enormous amount of data in YA.

I believe it is possible to download all your answers and comments from YA. Maybe you could consider doing this.

I already have copies of my answers. I have always strived to write concise yet accurate answers the whole time I have been on YA. I am seriously considering publishing my better written and most incisive answers as a collection of short essays. I have usually bucked the commonly held (and mostly erroneous) opinions of our time when it comes to astronomy and space (and certainly there is plenty there to buck). An excellent title to my collection would be "Unpopular Essays", but alas Bertrand Russell already used that title for a collection of his cutting essays a century ago. Great minds think alike, as they say.

Yes, but us that are Level Seven can leave now

It will be retrievable by forensic means.  Hard disc read/write heads aren't perfectly stable and wobble a bit as they do their business.  This means that the margins of the disc tracks will still contain the data if they need to be retrieved for some reason, e.g. criminal investigation.

Edit: I don't buy the black hole information paradox because a Total Perspective Vortex-like device would be able to retrieve lots of information alleged to be lost.