PT might have been socialist some years back, just like many of the European socialist parties used to be (many even used to be communist).
Party fragmentation is a non-issue, as they'll get combined. We are suffering a communist takeover - in everything but name - from some of the biggest parties around (including parties that used to have "liberal" on their name just shortly ago). Those parties that call themselves communist are quite divided, some supporting and some opposing the takeover.
That's an amusing claim given that most of these parties don't even get enough votes to get seats.
> We are suffering a communist takeover - in everything but name - from some of the biggest parties around
Pray tell which of your "biggest parties around" is it that you believe are socialist in anything but name?
I find this idea of a communist takeover bizarre: You've gone from a country with armed marxist guerrilla movements fighting a right wing military dictatorship, to a country where the president is an ex-marxist guerrilla.... Yet she represents a party that is no longer any further left than moderate social democrats, and hear policies places her pretty much as a centrist by European standards (and we don't have many actual socialists any more either) - heck, some of what she's done (her inflexibility in dealing with strikes, for example) would've made Maggie Thatcher proud.
None of your big parties are anywhere near being communist, despite the history of some of their elements.
EDIT: Not that you should trust your government to run a "safe email service" regardless. See it for what it is: A way of showing how annoyed they are about the NSA revelations.