Probably not, if you have disparate systems, or aren’t collecting the data you need!
Wondering what you should you do? Work out how to take back your data collection from 3rd parties. Social log-ins are a good example of how you could do this, and review your data collection processes. Ask yourself:
What am I collecting right now?
Where am I collecting it from?
Why was I collecting that data in that way? (there might have been a competition or campaign run at some point)
And finally, the biggie… Where is my data?