Otherwise your argument doesn't make much sense, linking to a list of 10 blog posts instead of 30 still doesn't show the user which specific post you wanted to link to out of a list of posts. Infinite scroll neither makes this problem worse nor better.
Comments
If that's your concern, than you should provide fragments (as they are intended to use) within the list of 30 posts i.e:
http://example.com/pages/1-3#2011-05-12-screw_hashbangs_buil...
Otherwise your argument doesn't make much sense, linking to a list of 10 blog posts instead of 30 still doesn't show the user which specific post you wanted to link to out of a list of posts. Infinite scroll neither makes this problem worse nor better.