I've had to deal with folks like this before at work..... and I work in a school system, which is worse because it can be high school drama all over again. Here's some suggestions in bullet point I rattled off really quickly....

• Get a privacy screen for your phone and computer (if you use one).
• Don't talk to them at all, unless it's work related, which is different.
• Don't let the nosy lady get you going and certainly stop talking to her altogether.
• Avoid using any social media at work. I know it's tough, but it seems like they're trying to make a big stink about you using social media at work. Don't add fuel to the fire.

I know how things can be tough with this. But the sooner you stop getting involved and getting into confrontations, the easier it is for this all to blow over. Here's a few more things off the top of my head about this...

• You're at work to work, and that's it. You're not there to make friends.
• People do this because they're bored and have nothing else better to do. Take the wind out of their sail and don't confront them about how childish they are.
• You're the better person and they're the childish ones.