And then the OP runs a questionable survey that doesn't warrant the conclusion (which by the way, is not earth-shattering).
- You could not be on Facebook / Twitter and still pick one of the other answers.
- You could be one of the services but not the other, and pick the first answer. What does Facebook "/" Twitter mean? AND or OR? Completely unclear.
- If the order of the options wasn't randomized, you would likely get a bias towards the first option. Don't know if this was the case.
But there is a bigger problem: one of the options is "I’m scared of scams." Regardless of reading order, if you read all the options before answering - and presumably most people do - then this causes what psychologists call a "priming" effect. You start to think about scams, and you can then behave very differently than if that option were not in the survey.
I just don't see why I should - creating an account using an email address is also easy and by this point don't most people understand how it works? If they managed to sign up for facebook or twitter, they clearly do!
How about companies like Pinterest and Spotify that only let you sign up with a Facebook or Twitter account?
For the rest, I'm quite sure there's a skew here, because people without internet access or not using it for browsing (mostly older people) should be under-represented. I don't want to believe that 65% of everybody in the US is using FB.
So yes, that's the web using subset of total population, totally fine for this question.
That aspect is more of an issue if you want to use Google Surveys to determine whether to start a new supermarket on Main Street. I hope the Google Survey people propose some other service for such inquiries.
And that's because I see no reason to associate my Facebook (family/friend-facing, lots of personal stuff on there) with any company. I like to keep a strict firewall in there.
But... they have a clear bias in favor of telling you that it's better than telephone surveys. Clearly you should not trust a claim like that without looking at an independent analysis.
That's essentially my answer. I have accounts with both Facebook and Twitter. I understand how the authentication works, and I'm not afraid such requests are scams (note: that's mostly a subset of not understanding how it works). I don't want my online identity tied to a third party account whose operator has few obligations to me.
But, it's not a survey design disaster and is likely a "directionally correct" reflection of internet users' actual behavior.
Are exactly 34.5% of the US Internet Population not using fb/twitter? Of course not, but I suspect that number is pretty close.
If you're building a social networking app, this is an opportunity.
Requiring to sign in with FB or Twitter is disrespectful. If some site offers external authentication, let it use OpenID or BrowserID already.
In my social circles, Facebook/Twitter usage clocks in at about 15%, so the numbers of the survey were at least minimally surprising ...
The problem here is that the sample is not random.
FB and twitter both spread enough tracking beacons (those like/share buttons) across the web that any attempt to use >1 accounts to distract FB or twitter are probably futile.
* a high of 41.7% for the 65+ group.
and moves steadily down through the groups to
* 27.4% for the 25-34 group.
but then jumps back up to
* 34.7% for 18-24 year olds.
The people without FB and Twitter are late adopters and won't try your service no matter what kind of auth you use. For the people that are concerned about privacy, I'm not sure how big their impact will be.
34.5% of the people who took this survey claim they are not using Facebook/Twitter.