Nice and simple pastebin alt.
May I suggest ability to have simple E2E encryption, so you, the service provider aren't aware of the shared content, thus can reduce legal complications.
Example:
* Have a encryption key generated on client side
* Share link will becomes http://txti.es/{POST_ID}/{E2E_KEY}
* You, as service provider, only stores POST_ID and its encrypted content.
* Link sharer passes the complete URL around, which contains the key to unlock the content
* Content are fetched and decrypt on client side