Are you posting updates or discrete entities? Then new on top.
Are you having a conversation? Then new on bottom.
On a recent blog-like system I did, new entries went on top, but new comments (on the entries) went on bottom. Email works the same way - new threads will sort on top, but within a thread new messages are on the bottom.
Are you having a conversation? Then new on bottom.
On a recent blog-like system I did, new entries went on top, but new comments (on the entries) went on bottom. Email works the same way - new threads will sort on top, but within a thread new messages are on the bottom.