In Animal Crossing New Leaf, I searched and searched, but I found no tweeter! Am I supposed to invite friends to my town? Or am I supposed to earn it?
According to a wiki
It is obtained from visitors in the Happy Home Showcase you have streetpassed 9 or 10 times.
It can also be obtained one from Isabelle at the New Year's Eve countdown if the player speaks to her twice.
According to the Animal Crossing Wikia Tweeter page, you're supposed to Streetpass™ a single person ten times to get it.
From the AC3Wiki:
- First time: Nothing
- Second time: balloon
- Third time: balloon
- Fourth time: pinwheel
- Fifth time: bunny balloon
- Sixth time: bubble wand
- Seventh time: heart balloon
- Eighth time: ice cream
- Ninth time: soft-serve ice cream
- Tenth time: tweeter
- More than ten times: Random item listed above
You will have to go to the plaza and talk to the person you Streetpassed™. Supposedly, they will be holding your prize and they will give it to you after speaking with them.
Alternatively, if you talk to Isabelle twice on New Year, she'll give you one.