...I'm totally fine not having a 'Login with Facebook' feature, and don't feel social media features make forums any better... We all know Google, FB, and every other major internet player records every action and click these days (and often shares info in a non-transparent way with other companies), and I always appreciated that KLOV was not part of that ecosystem.
I've never been big into social media integration, and I'm not much of a social media user myself. We are actually going to try some integration later this year on a very different (non-forum) web site having nothing to do with arcades, but even then, all it will be is a tool that allows someone to log in with Facebook or Google and then our site will ask them to please set up some basic account information to make account recovery easier and to help wean them off the integration.
It's pretty impossible or at least impractical to have a site and not be part of 'that ecosystem'. We try to have a minimal footprint, but we still have some. It's permitted in the terms and conditions of the site. In short, we participate with Google Analytics/WebMaster and Quantcast on the site to help us understand use of our site, what is working or not, and in general, the nature of our userbase and how we should plan for the future. In the future we might release broad data to our supporters, like number of visitors, where they basically come from, etc for, for example, fundraising purposes (though we aren't looking for any grants or similar now.)
Additionally, our eBay tools, while 100% custom built (and IMO opinion great---I'm a frequent users of them) take part in an eBay affiliate program so there is that touch there.
On the main site, add social media buttons for Facebook, Twitter, and LinkedIn. A total of 3, down from maybe 7 at the max.
If any of this bothers you too much, there are ways to adapt. For example, the Ghostery plug-in for the Chrome browser. It will block among other things, Google and Quantcast as you wish and is customizable.
On our site, it currently blocks Google, Quantcast, and eBay by default. For the most part we aren't running other many ads anywhere on the site, but in the past have worked with Yahoo and Google. One, and only once as I write this post, Ghostery said it blocked something called Tinypass on these forums for me. Tinypass is usually used for Paywalls. I couldn't figure how where it came from, but it clearly came from one of of the three. And I really don't care if eBay knows I'm interested in amusement machines.
On FoxNews.com, Ghostery finds 19 things and blocks 14. On CNBC, it finds 19 and blocks 16. On CNN, it finds 26 things, and blocks 24. On redcross.org, it finds 12 and blocks 9. nature.org finds 19 and blocks 15. metmuseum.org finds 14 and blocks 9. Strong museum of play finds 9, blocks 7. In fact, in a quick look at charities right now, I only found one that was as gentle as our site (the Salvation Army). That's probably because most organizations are more advertising oriented.