Unsure about ability to provide a full list of past emails+phone numbers. Is this a problem for visiting the US?

The enhanced rules for ESTA/DS-160, for people from the UK visiting the US for tourism, is reported to now require present+past social media accounts, and also email addresses and phone numbers used in the last 5 years. Apparently these are now (or may become) mandatory.

I'm a bit unsure about my ability to provide the latter two pieces of information, or at least, the rules leave me unclear about what to provide. Obviously the last thing I want to do is provide anything that might be deemed untruthful or inaccurate, but guidance is hard to find.

Phone numbers: I use my own mobile phone, whose number I obviously know. I also use a landline when at my parents, as I've had to live there for an extended interval during repairs to my house. Obviously if i was visiting it wouldn't be an issue.

• Does the fact it's a landline where I've lived, even though not in my name or at my home, mean I have an obligation to list it as "my" phone number?
• Simultaneously my own landline may still exist, I don't know. I haven't had a landline phone for years. Due to the repairs I don't know if it's connected or not, and I'm not even sure if it's being billed or not. I don't know what its number was, or would be. But it was certainly enabled in 2015-2016. Beyond that I don't know, and I don't have details of it from back then as I never used it beyond a few test calls. It was only provided to get internet, but even that wasn't used after 2015. What should I do or say about this?

Email addresses: I have had fairly stable email addresses for the last 5 years, so that's not an issue. But I have frequently used temporary online "disposable" email addresses, to sign up for forums and websites needing registration, or to avoid spam. I haven't got a hope in hell of remembering all of them, as, by their very nature, they were used once or twice over a period of an hour to a day or so, then never used again, their details temporarily on a scrap of paper or an unsaved text file, deleted or thrown away afterwards. What should I say or do?

Additionally I'm likely to run my own email server in the next few months. When in do, then technically any email to/from MYDOMAIN.UK will be mine, and I could well use dozens or hundreds of throwaway and separate email addresses for different services, to further reduce spam or curtail marketing crossover, or for job applications. (I'll still use online third party ones as well). And of course I may get spam emails to me, that don't correspond to an active email address but I did once use, or are sent for spam purposes guessing at account names. Essentially my emails will at that point include "anything sent from these domains", but most will be again, disposables used once briefly.

Social media: the BBC report says that apart from 20 named sites, "any others should be volunteered". But what is the legal definition used for a social media site? The internet blurs categories from IRC and chat clients, to forums (including forums for technical matters and forums with social aspects, usually they blur a bit), professional and leisure collaborative websites based on wikis, where users may work together and again might be considered social, and I've used a huge number of tech and other forums and chat clients, some once-off, some ongoing. Is a private chat using a chat client app with one individual, "social media"? What if the same app is used for a chat with 100 people? Again, impossible to be sure to list all, and unsure which are required to be listed.

As this is an important form to get right, its important that answers should shown some kind of support or backing, to be sure that the advice or replies are actually based where possible on US government advice, practice, guidance or advisories (if any exists) or cases from the past if needed, or something like that.