Not only has word verification outlived its usefulness; it is also now counterproductive, having become completely unreadable, thereby preventing humans - let alone robots - from posting comments.
So I've switched it off.
In any case, the verification function is a relic from the days when weblogs were cutting edge social media and targetted by spammers. Now we're as old hat as sending birthday cards and thank-you notes through the mail.
Presumably robots are no longer interested, and are trying to ingratiate themselves with the Twitter crowd.
We'll see. Meantime, commenting is easy again.