If family black sheep had grades, mine would be obsidian.
Firstly, you can't convince your family what they do with their time online; just like they can't control yours. Also, sometimes when you decide to stand up for your ethics you have to endure some negative outcomes. I am often the person people turn to when they need help with their computers, I refuse to help people with social media problems. I simply tell them that they have already fucked their privacy and they are beyond help; they can figure out how to reset their password on their own. This is not a popular stand with people in my life, I don't really care about being popular thankfully. I just lack that bone in my brain.
Yes, sometimes they say mean things to me. I just walk away from them and stop talking to them for awhile. When we interact again I tell them what they said to me was hurtful and disrespectful; then I drop it. I do not expect and apology.
I haven't used consumer social media for some time now and even when I did have it I was very conservative about it (no pics, everything on my profile was a lie, primarily just sent direct messages). Sometimes family members will force a picture thing, it happens. I don't have these big debates about it, instead I simply refuse to take a good picture. I never smile or look like I am happy in a cell phone picture because I am not. I have gotten really good at looking away or down at the ground at the moment the pic happens. I am the master of the impromptu sneeze. After awhile people stopped asking me to take pictures with them because I kept ruining them. I also offer to take pictures with other peoples phone, you can't be in a picture you took.
The big thing to do is to delete your own accounts if you have not already done so. I found once people no longer had the option to "tag" me in things their desire to include me in their stalkerbook exploits dropped precipitously.
