The wiki indicates that voting is a desired feature for the platform Overstock chooses. Peershares does not have this today, but the NuBits project has an excellent system for voting on motions implemented and passing unit tests. We have intended to move the code into the open source Peershares template but have not prioritized that yet. If Overstock demonstrates interest in Peershares we can prioritize merging in that motions voting system.
A motion with any type of content is composed and a hash of it is generated. To vote for it, a user enters the hash in their client. When they mint a block the hash is placed on the blockchain. The client tracks the number of blocks that have voted for each motion over the last x number of blocks.