The Internet never forgets. No app is going to change that because Internet is de-centralized and de-centralization makes it impossible to know if the data was really completely removed or not.
Let's face it: the only way to not expose your personal info is to not share it in the first place (forget silly Facebook, G+, Instagrams and all that stuff). If you've already done that, make sure that whatever you are doing that might lead to doxxing is done with your other identity (although this is hardly fool proof since linking identities can happen in many unexpected places). Worst of all is that that kind of infomation, once it slips, is impossible to contain and you have to cut ties and start over.
Not relevant. I've never used social media a day in my life. Nevertheless, clicking a few links in this article turned up my full name, age, birthday, every address I've had since I was 14, email address, and convenient links to pages containing that same information for every member of my family. This is all obtained from public records over which you have literally no control if you lead any semblance of a normal life. There should be more legal protections in place to prevent using public data in this way.
The issue at hand isn't really related to "silly" Facebook, or other "cultural" sites.
Unless you straight-up do NOT: own a home, rent, buy anything, go to school, etc. you will have some kind of available public record.
Yes, it's true that many people go beyond this with what they make available on social media and that's a definite issue. When people start "combining" excess social media posts, with "outside" known data...that's when you've got an issue. This usually results in people being able to EASILY dox someone due to the social side of things giving out information that is normally "protected"(think maiden name, previous locations, relationships, dob/location, etc.), all of which can be leveraged with public information to nearly total dox someone.
At the end of the day, we're in a new "age", where people will have to learn to protect their internet identity, as well as their "personal".
this information gets populated without you sharing it. if you pay utility bills, rent, buy a house, appear in court, or other similar acts, those acts get stuck into online databases forever.
so to not "expose" your personal information is to not buy things and live in a tent. but be sure not to get arrested for trespassing or vagrancy...
Let's face it: the only way to not expose your personal info is to not share it in the first place (forget silly Facebook, G+, Instagrams and all that stuff). If you've already done that, make sure that whatever you are doing that might lead to doxxing is done with your other identity (although this is hardly fool proof since linking identities can happen in many unexpected places). Worst of all is that that kind of infomation, once it slips, is impossible to contain and you have to cut ties and start over.
Relevant: http://en.wikipedia.org/wiki/Streisand_effect