I have noticed most, if not all, forum websites are being displayed in the results with wrong last post dates. Google shows additional information under forum results including the number of posts, number of authors, and the last post date.
For the past few weeks, maybe longer, Google has been showing the date the thread was started, but still referring to it as the last post date.
This is not an issue for short threads, but on some sites where a thread can last months or years, it does make a big difference.
I have seen this for phpbb and vbulletin sites, and probably others.
I would have expected Google to detect this error and correct it by now, but it makes me wonder if they made changes to their date processing algorithm as part of preparing for Penguin.
I'm wondering if anyone else has noticed this and maybe knows if it is an issue with the forum software or with Google?