[siim_osur]

Some of us are likely never going to stop referring to it as twitter.

X, may as well be 3 Xs.

[tracker1]

I still call it Twitter... I just don't think "X" works nearly as well in conversation.

[LorenPechtel]

Xitter.

As in the Chinese X. Remember how their leader's name is pronounced.

[greatgib]

I still always go on the site using twitter.com domain or search.

[mbirth]

At least in writing you can use [insert double-stroke X here - which HN can’t display] to make it clear that you mean the social media service. (Unless you’re talking to mathematicians.)