What is good way to politely decline an invitation to meet up?

[R]

One of my followers on Twitter (we've only exchanged a handful of messages) sent a message recently asking me if I want to meet. I am flattered, but we live over 2 hours a part and like I said, we have only exchanged a few messages. How can I decline the invitation without being rude or hurting the person's feelings?

[Kaz]

Say you've lost most of your name, you know it starts in the letter 'R' only and will take alot of time to find.

[Ring0Rosie]

If you may want to meet this person in the future, say something like:
"I really enjoy talking to you online, but my schedule is just too full this time of year. Maybe we can meet up in the summer time instead when the weather is better!"

If you don't want to meet them EVER:
"I am sorry, I have a policy that I don't meet people from online. I've just heard too many horror stories."

[Move on]

No thank you. - A polite decline. You are not responsible or have control of others feelings.