tbh a lot of this sounds like playground stuff rather than serious get-the-governing-body-involved serious matters.
Firstly, the PTA has no involvement in the running of the school nor do they have any influence. The PTA is there for fundraising purposes only.
Unfortunately, a lot of PTA's have a reputation for being cliquey, and lots of people will tell you that the older members tend to be resistant to change while newer members get frustrated because they want to bring in new ideas. It happens in schools across the country and is immensely frustrating. And equally, some heads are open to the ideas parents have, and some aren't. And given a lot of fundraising things happen on school premises and involve the head or other staff needing to be there, they are often reluctant because having spent twelve hours a day there five days a week (well the head at least), they're not so keen to put in an appearance at the weekends.
The only thing you can realistically do wrt the PTA is to join and to try to suggest things that the head, and the older members will be open to. But if they're not, then just to bide your time - the older members will be gone when their kids go (many leave when the kids hit year 6 as they want to do the fetes etc with their kids rather than being part of it then), and then you'll be the older member with the ideas...
Wrt photos, this is very common practice. Most schools require parents to sign a consent for their children to be photographed, if consent is not given for one child in a group then no-one in the group can be photographed. Often this is for child protection reasons, where a child might have been relocated due to domestic violence for eg, and if the child's picture were put on facebook then the child could be traced and be at risk. It does seem harsh but in an age where photos aren't limited to the box under the bed and can be distributed across the entire www it's something that needs to be considered.
I'm not sure what you want the governors to do about the PTA though?
And lastly, I'm sorry but griping about it on facebook is just juvanile, and I can see why it annoys people. People need to start realizing that facebook really isn't a platform for serious discussion.
If you have serious issues with how the school is being run (in terms of the education of your child), then I suggest you have a discussion firstly with the head and if no satisfaction then the chair of governors. But what is and isn't allowed wrt the PTA really isn't grounds for considering removing children from the school.