The full pattern
Who likes it comes first; the verb agrees with the thing liked.
| one thing | mi piace il mare |
| an activity | mi piace ballare |
| more than one thing | mi piacciono i film |
| who likes it | mi, ti, gli (him), le (her, Lei), ci, vi |
| reacting | a me, a te, a lui, a lei, a Marco |
The thing you like is the subject, so io piace is never right.
No: non mi piace. Non goes before the little word.
Me too: anche a me. Not me: a me no.
For loro, Italians usually say gli piace. It’s correct everyday Italian.