A lot of companies have adopted apps such as UserVoice(http://uservoice.com/) for different purposes.
If you want to investigate the idea of using it for your own company, people have already built services that hosted reddit/hn clones.
http://slinkset.com/
If you want to investigate the idea of using it for your own company, people have already built services that hosted reddit/hn clones. http://slinkset.com/
and if you need more meat, reddit is opensource