You can now propose and vote for new tag synonyms.
Are synonyms with enough votes automatically promoted to a synonym, or are votes just suggestions to Mods that it's a good idea?
Some clarification on this new feature would be great.
The tooltip on the voting control says "total votes (when a synonym gets a score of 3 it is automatically approved)".
So it would appear to be completely automatic.
Since the threshold is so low, I'm curious if there is a reputation threshold for the vote itself. Waffles commented on my tag synonyms system proposal saying "status-completed" so I'm assuming there is a threshold, but probably lower than the 5k I proposed (since I also proposed a vote system with thresholds of +5/-5 instead of 3). Anyone with a test account want to take a peek?
EDIT: This is now more clear. A proposal is accepted at +4, and rejected at -2. You currently need 2k rep to be able to vote (either way).
Every new feature on SO worked like this.
They are pushed live with no explanation, but a blog post quickly follows it explaining it in detail.
I guess it's their way of beta-testing things with low traffic (you need to find it yourself) and with no knowledge of how it works (tests usability)