I mentioned it as an anecdotal observation in my talk, so I went back and counted the appearances of online identifiers on the 159 re-mixable badges for the OERxDomains 21 Conference. I counted 91 twitter handles, 15 domain names, and 1 Instagram handle.
There were a couple people who used email addresses. A few people listed multiple twitter handles, and one enterprising person (not me!) listed three domain names.
Because the badges were customizable, people (or their animals and a few organizations) had the individual choice of what text to put on their personal badges.
Hopefully we’ll do better on using domain names at the next domains-related conference. 😜