another question or three

So, in this process of moving over from LJ to DW, I've been subscribing to as much of my LJ FL as exists over here, or that I can find under the same usernames, at any rate (any advice on how to find people who might be on DW who I only know by their LJ username would be useful, short of sending PMs to each one -- I will post on LJ asking for them...).

Occasionally I've been seeing soandso.livejournal.com in people's DW FLs, too, which is kind of confusing. How does that work? Does that mean I can read people's LJs on DW? What about commenting? What about email notifications if someone replies to those comments?

Oh, and how do I get rid of that "most popular tags" thing in my sidebar?

Thanks!

one more test

To see if the footer works on LJ.