Presumably so that other people can continue the development.
I've been talking with the developer in question this morning, and he'll be putting the code into Git this evening or this weekend, as he has time.
Can you point me to the bug you're talking about? Thanks.
If you don't use any social providers, you'll never enable the social integration features in Firefox. Mozilla has hundreds of engineers working to make Firefox better. Not everyone is going to find value in what every one of them are working on. Social API is a small team, just a handful of developers, working on something that *will* be useful to hundreds of millions of Facebook and other social service users.
The Firefox Social API doesn't allow for the sidebar or other social features to know about the content of the pages you're visiting. You can read the docs if you want to learn more. https://developer.mozilla.org/en-US/docs/Social_API
It's not an opt-out. It's an opt in. Users who don't want to see it won't. You'll only see it if you're using a supported social service and you opt in. Otherwise you'll never know it was there.
The only possible interpretation of any research whatever in the `social sciences' is: some do, some don't. -- Ernest Rutherford