Google would be a better option. There is also a search feature on here. So you may want to search "grounding" on here for example and you'll get great results. I do silly searches on here when bored and trying to ease back into exposure on the site and the search option on here has always been great.
But, with google, you'll get other forums, blog posts, articles, etc. A lot of better options then just Twitter. Same with Bing. Whichever you use is fine. And you want to narrow the search down to self help for PTSD (and can search those specific words even) rather then just PTSD as with just PTSD you'll get the diagnosis criteria, research done on PTSD, talking about it and stigmas. And since you are talking about non-veteran PTSD you may even want to include that or include "PTSD caused by _____" in all of your searches. So an example is "grounding techniques for PTSD caused by childhood abuse". That will help direct results away from veteran specific stuff.
But the good thing about searching on here rather then google or anywhere else, the word "grounding" (in my example" is all that is needed as PTSD is already assumed. That goes for anything. Help with Flashbacks (during or after) just search "Flashbacks" where in google you'll need to be more specific like "how to reduce flashbacks for PTSD caused by childhood abuse" as example.
I'm an avid researcher so these are some things I do an am pretty darn good at. Researching and google searching and what not.