Unfortunately, where Gmail shines with its rather strong antispam mechanisms, Blogger currently has little to offer in terms of automation.
For those wondering how things are on WordPress, here is how it works:
- WordPress can do either full manual moderation or use some basic filtering rules which will place the comments running against those in a moderation queue (filtering by words and by amount of hyperlinks)
- Various plugins can provide more and smarter antispam filtering, the most common one being Akismet (which works well for me).
Using Akismet, at the time of this writing 122 spams have been held for review, and so far I haven’t had a single false positive yet. Nothing else has been sent up to moderation so far (though Akismet probably catches them all anyway). Part of the moderation duties is simply logging onto my dashboard once a day, clicking the Akismet queue, browsing through the spam and hitting “delete all”.
Altitis still has a moderate readership, though, so the workload associated to comment spam fighting remains very light. This has also allowed me to leave comments unhindered by word verification methods so far. If I were to implement those, there’s a bunch of plugins available to do the job here too.
And that’s pretty much the exact shade of green on my patch of grass.