In All Seriousness: PSL or Greens?

There's been a lot of memes going around, but I genuinely have a question. If PSL were on the ballot, I would obviously vote for them. However, they're write-in only in my state. Would writing in PSL have the same effect, or could the vote more easily be invalid or ignored.

In other words, is it better to vote for Greens if PSL is write-in only?

EDIT: THANKS FOR INPUT! I've decided to write in Hilary Clinton, have a wonderful day!

But really probably writing in PSL. Elections don't matter too much though, so I'm ever in an area where PSL is active, I'll make sure to join (which has been the plan for a while). Thanks again!