Comment 7 for bug 696037

TL;DR: Dropping identi.ca support would be a net negative for the Michigan LoCo as they experience more spam on twitter than identi.ca.

Here's the thing:

The Michigan LoCo uses identi.ca primarily because we set up a group, which allows us to control spam much more effectively than tags (they can be moderated). We use it more of an announce list as opposed to discussion, but that is neither here nor there.

From our experience, the vast majority of spam showing up on the LD is from twitter, because someone can signup for twitter, blast all of the relevant #ubuntu tags and then be marked a spambot but that still shows up in LD. The same is true of identi.ca, but it happens much less often for managed groups like the Michigan LoCo's.

Groups have all the same feeds (rss, atom, activitystreams, even foaf) as tags thus are no more complicated to support.