Just with Twitter, we know that content is regulated by region. Setting your location to Germany will prohibit seeing certain content from the U.S. Many more such regional cases.
The spam example would be a problem, but it's more of an annoyance to solve than a basic human rights case. You simply cannot have a democracy where segments of the population are barred from interacting with public officials online. Especially when public business (advertising, fundraising, making political arguments) is now a core of online communications.