Archived proposals can be found at Pikipedia:Policy/past proposals.
This page is used to propose policy to be put into place at Pikipedia. To make a proposal, create a new section with an appropriate title, followed by a summary of the proposal and your reasons. Next, create 'support', 'oppose' and 'comments' subsections and sign your name under 'support'. Other users can then sign their support or opposition, optionally making extra comments, and the policy will be implemented if it gets enough support.
As well as new policy, you may propose changes to or removal of existing policy in the same manner.
Videos
I think we've pretty much decided that video embedding should be used sparingly, only for things like adverts and glitches that are much more easily understood through them than through still images or text. GP
Social content
Should be mostly kept off non-user/talk pages, but small amounts, perhaps along with more appropriate things, are fine. The main location for lots of chat about anything other than the running of the wiki and its content should be the off-wiki forums. Even user talk pages shouldn't be used if there are lots of edits in a short space of time, because it fills up the recent changes. GP