Count all possible Tweets
Emotion, 17 bytes


Explanation
 Push literal 280
 Enter an iteration block over the first stack value and push the iteration element register at the begining of each loop.
 Push literal 1
 Push the sum of the second and first stack values.
 Push literal 1114112
 Swap the top two stack values.
 Push the first stack value to the power of the second stack value.
 Push the sum of the second and first stack values.
 Ends a control flow structure.

Try it online!