Simplest way to host a text online as reliably as possible?

If you need reliability, I’d go with something like Amazon S3, with buckets in two locations.

Google Docs

I’m guessing those are similar to what you need:
http://pastebin.com/ and http://pastebin.ca/

Just to clarify that my desire is that it is likely to remain online for eternity (e.g. not be lost due to a crash of the server or a bad managed company or whatever) but still allows me to post a text online and get a URL for it and pronto, no registration etc.

The purpose is mostly to be able to extend a few tweets now and then, but without having to host somewhere sequential.

Yeah @phoebusg thanks

I second @robmandu‘s suggestion. Google Docs, for sure.

I really dig Simplenote.

@rexpresso I’d go with pastebin