The site has been bombarded by spam for quite a while. Usually a few hundred per day, but occasionally over a thousand. The only way to combat this for now is to turn off comments. Hopefully a better solution can be found in the future.
Because of such a large amount of postings, it has not been possible to look at every single one. If there have been a couple of legitimate ones, then they will have been deleted too. This is truly a shame and I feel bad about that and apologize to anyone who may be effected. With the many thousands of postings, however, I can see no other way.
The software for the site will be upgraded shortly, and a stricter requirement for posters will be implemented. Hopeful this will all pass and we can move on.