Random question for those of you out there!

When following artists on multiple sites, if you see the same post on multiple sites, how do you manage your comments?

Do you:
1: Leave the same comment on each site's post?
2: Leave a different comment on each site's post?
3: Leave a comment on a specific site's post (if available)?
4: Only comment on the first site's post you see?

This is just purely curiosity on my part. Personally I sometimes do 3, sometimes 4, and I think I've only partially done 2 once or twice.