If you have a website that for some odd reason doesn't provide an RSS feed, several 3rd party services will make one for you. Such as:
Feed Creator You have to have a bit of HTML knowledge for this one.
Feed43 is a freemium service with free and reasonably-priced annual plans
Feedity doesn't have a free plan, but claims to have an API for developers
There's also a Google Script that also converts your Twitter stream into RSS.
If you can self-host PHP scripts (which is almost everybody) you can get RSS-Bridge and covert any number of social media streams into RSS feeds.