Do you mean "own" metaphorically?
Anyways, this is from Twitters TOS[0 §5]:
> You retain your rights to any Content you submit, post or display on or through the Services. By submitting, posting or displaying Content on or through the Services, you grant us a worldwide, nonexclusive, royaltyfree license (with the right to sublicense) to use, copy, reproduce, process, adapt, modify, publish, transmit, display and distribute such Content in any and all media or distribution methods (now known or later developed).
Basically, they don’t take copyright of what you post (in contrast to what OP said), but it doesn’t matter because they can do what they want with it.
[0]: https://cdn.cms-twdigitalassets.com/content/dam/legal-twitte...
> Be kind. Don't be snarky. Have curious conversation; don't cross-examine. Comments should get more thoughtful and substantive, not less, as a topic gets more divisive.
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
https://cdn.cms-twdigitalassets.com/content/dam/legal-twitte...
Afaik there is no fair use or DMCA here