Q:

Latest activity at Area 51 could be wrongly calculated

See the LATEST ACTIVITY in the right bar. Currently it shows misleading information.
See Debate Society. Latest activity shows Jun 30 '10 at 4:02, but the proposal has more recent activity. See recent followers (Nov 12 '10 at 0:59), comments (Sep 5 '10 at 19:40). I can't see when the last vote was cast but I'm pretty sure it wasn't 6 months ago. That proposal is not a single example, there are hundreds more. Another one is The Practicing Musician.
This report originated from What's the time necessary for a proposal get deleted on Area 51? See comments on Robert's answer, especially the last one.
Is it a bug or by-design? For me it's a bug because it provides misleading information.

A:

"Latest Activity" is supposed to reflect the last time the proposal itself changed, so you can at-a-glance see if there's something new for you to do / see here.  That includes edits to the title and audience, or new example questions so you can take a look and vote on them.  It doesn't include followers / comments / votes, since there's nothing for you to do when those are added.
When we do the query for "no activity in over a month" to delete dead proposals, we are more liberal and include new followers and votes, since that means the proposal isn't dead yet.
I don't think there's a need to make Latest Activity the same as in that query, since this isn't really something we want users to think about or try to game.  If a proposal isn't getting any activity for a month, it's not going to work as a site and you're only wasting your time trying to ping it every few weeks to keep it alive.

