Would be useful to understand crawling with help text

I recommend adding some help text that will help users understand when the services are crawled. I added my Twitter service and it only pulled 10 or so tweets from March, even though i know there are older ones. So, "Where are the others?"

Could be good to help them know that the service only crawls past a certain initial date, perhaps per service. "Initially, we only grab the last 30 days of tweets. Going forward, we’ll look for new ones every 30 minutes or so"

Or is it possible to request BitHub to go back further? In my case, 30 days isn't much content.