So the company requesting the background check for a job get's to decide what they'd like included. Which means they believe knowing what you tweet is important

So the company requesting the background check for a job get's to decide what they'd like included. Which means they believe knowing what you tweet is important. Probably due to all the public flogging of companies where someone was found to have posted "inappropriate" things (or donated to an "inappropriate" candidate, etc.). Where inappropriate is defined as whatever the group of people doing the flogging think shouldn't be done so you get a rather large pool once you combine the definitions from all groups.