These can be nicely done with WordPress using custom post type for link submission, so then the rest becomes very easy using a few plugins:
- Voting – CMS Vote Up Social CMS
News will handle the voting. - Easy link submission – simple custom front end post form would do the job (ex: here or you can use plugins like Mini TDO, Gravity forms…
- Member creation and restriction of
groups – this is build in with WordPress, users and roles - oEmbed support – here is the only part i can think of that you would have a lot of work with unless you mean giving users ability to oEmbed there links like youtube in which case you can use the built in oEmbed support.
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