It's an obvious fact that various higher institutions in Nigeria push in thousands of graduates into the already saturated labour market without requisite vocational/entrepreneur skill to meet up with the challenges and reality of joblessnes in the country. A few might be lucky enough to get jobs,other might be fortunate to start a biz or acquire a skill while a sizeable number still resort to various job sites on a daily bases for vacancies/job openings.
These jobsites ranges from jobberman, hotnigerianjobs, ngcareer,jobzilla,nairaland(to some extent) etc. I've been privilege to read about people who got jobs through nairaland but hadly have I heard of any from other jobsites.

My question is: "Has anybody ever gotten a job through these other afromentioned/any jobsites in Nigeria"?

Yes, people get jobs all the time at least through our platform www.myjobmag.com. What is important is to understand is how job site works. On job sites, there are two types of advertisement. The ones directly advertised by companies involved and those that are seen on third-party sites or career pages of the companies.