I run a fairly popular forum on one of my favorite subjects and recently Google has begun sending visitors deep into many threads, such as to page 7 of a 20 page discussion instead of at the beginning on page 1.
While I appreciate the deep linking and in general I am happy with the targeting from Google for this site the new deep linking is causing problems, and an increase in bounce rates. What it looks like is happening is people are landing in the middle of a discussion and getting lost or not understanding what people are talking about, something only the first post truly covers, and are back-paging or closing the browser without reading other pages in the thread.
It's become a problem, is there a way I can let Google know that the first page of any thread should always be first choice without blocking googlebot access deeper into a thread?