Constant google popup ads!

[jhimmel]

I think it was the app Ringtone Maker

If you read the reviews of that app you will see numerous complaints about intrusive full screen popup ads. Always read the reviews before installing an app you are not familiar with. I stay away from apps with small number of reviews, and/or complaints of adware. I also use ad-free "pro" ($) versions of almost everything I install.

 

[SDTRMG]

From what I can tell these are Twitter ads. I have uninstalled Twitter but they are still there. Now what??

They've definitely weren't coming from Twitter, it's usually the most unused under functioned app. Ring tone apps, photo editors, file managers, some camera apps.

It could be an app you had installed previously that the developer updated.