A: I like pears.
1. Same here.
2. That makes two of us.
3. You can say that again.
4. Me too.
5. So do I.
6. I think so, too.
7. I agree with you.
(Can we use all the responses? #6 and #7 seem to be a little strange.)
A: The movie was great.
8. Same here.
9. That makes two of us.
10. You can say that again.
11. I agree with you.
12. I think so, too.
13. Me too.
(Can we use #8 and #9 in this situation? What about the others?)
1-7 are all OK to use.
In 8-13, only 10, 11, and 12 can be used.