Is discussing marital problems or raising a social issue that happened to a relative in respected forums, in order to seek advice and consultation or to provide an example, considered haram or a disclosure of household secrets?

There is no harm in mentioning stories in forums as long as it is done without mentioning the names of the individuals or identifying them, and the purpose is achieved thereby. It is necessary to consider that forums are accessed by the righteous and the unrighteous, by those with sound judgment and opinion, and by others among the common folk and the ignorant.