I generally dislike when periods are taken as part of the URL. Then you can't end a sentence with a URL like http://example.com.
HN does it right, but Gruber's example seems to put the period in the URL.
HN does it right, but Gruber's example seems to put the period in the URL.
http://en.wikipedia.org/wiki/O3b_Networks,_Ltd.
HN does it wrong. There are exceptions either way, I wouldn't say that one is more correct.