This is a potentially good idea, however it might just lead to a lot of users spamming for their alts to gain merits.
Although, one thread with one legitimate/accurate post in 20 is probably worth making to see if we can distribute merits a bit. I'd suggest limiting people to 5 posts to nominate per week or something to avoid having a huge backlog. And that posts should be quoted (and not just links to them being posted).