Why is Jodi Arias allowed on social media?

[Brad]

She has just been convicted of First-Degree Murder more than a week ago, and yet she's posting all kinds of jargon on Twitter. At this point, I don't even consider her to be an ordinary citizen. I don't think people like her deserve to publicly express their narcissistic BS by any means. Is she legally entitled to use social media?
Btw I am aware that Jodi isn't directly tweeting anything, and that she is telling someone else (via telephone) is to do so on her behalf. But really it's still Jodi Arias.

[Sídhe]

There is someone posting on her behalf. It is not her personally.

UPDATE: So, your question is if someone -- who is not in jail and has not committed any crimes (and probably her lawyer or a family member) -- is allowed to use social media on Arias' behalf. The answer, obviously, is yes.