Can my iphone get twitter-hack based malware can it spread to/from my macbook pro

So I fell for one of those hack-generated twitter DMs - sent form my older sister's account to mine. Openned it several times (requested I log into twitter via webpage when I was in the app). Found out today her account was hacked. I also openned it on my macbook pro (running Snow Leopard). My questions are this...

1. Can I get malware on my iPhone 5?

2. Should I just wipe it and then re-sync? Everything is backed up to iCloud.

3. Could I have gotten the malware on my Macbook?

4. If I plug my iphone into the Macbook could it translate from one to the other?

Neither device is "jailbroken".  And I'm changing my passwords as we speak. Or will be again if need be.