“… The government really doesn’t have any interest in tracking someone’s Twitter account if they’re not doing something wrong or suspected of doing something wrong.”
— Mike German, ACLU

“[information gathered using the app] could be cross referenced with other databases to identify potential threats.”

And could you please define what “Potential threats” means?  Mr. German is correct.  The government doesn’t have an interest in tracking you if you’re not doing something “wrong.”  What’s the definition of wrong?  Wrong thinking?  Wrong ideas?  Wrong topic for discussion?  Wrong non-government approved food storage?  Wrong shooting range event because you lack the proper permits and could be doing paramilitary training?  Wrong bible study because the bible you’re using says that homosexuality is a sin?  Wrong home school curriculum because you’re teaching your children that the founding fathers advocated resisting tyranny? 
I wouldn’t have a problem with the government using a system like this to track real terrorists.  But what concerns me is their demonstrated inability or, more accurately, unwillingness to do the things that actually WOULD contribute to our national security, such as sealing our borders and scrutinizing young Arab males at the airports instead of children, elderly, and attractive women.  
What concerns me further is the temptation to use this technology to track political dissenters and other “potential threats” in a world where the government is continually redefining terms such as threat, terrorist, extremist, and enemy.  We’ve seen multiple attempts in recent history where American Patriots with traditional American values have been labeled as “potential domestic terror threats.”  Quite frankly, this has too much potential for abuse.  
A little less freedom in order to be safe?  No thank you!  I would rather live free and be less safe, because there are too many examples where less freedom resulted in loss of security in the long run.  Worse, it leads to a false sense of security.  
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By FOX News
WASHINGTON – The FBI is getting in on the law enforcement app game — posting documents online recently to seek industry input on developing the equivalent of a web alert system.
The 12-page document, called “FBI Social Media Application,” provides a detailed picture of the bureau’s specifications. The program must have the ability “to rapidly assemble critical open source information and intelligence … to quickly vet, identify and geo-locate breaking events, incidents and emerging threats.”