not sure which ones we need to worry about, but they shouldn't go unnoticed

Is this a good idea at all? only for stolen bikes? only for bikes that have non-stock photos?

if there is text before and after "@IsItStolen" those substrings should each be searched for, because probably only one of them is the serial. If there are hashtags, this could result in more than two substrings...

I don't anticipate much downtime, but if we miss a tweet because the script was not running, we should backtrack and reply to recent missed tweets. This requires persistently saving last tweet responded to so we can use the REST API's mentions_timeline with since_id to grab tweets from the past.

Another thing to consider is responding to tweets that happen when the streaming API is down.

Like a date and a geocoded location. If we're getting fancy, could use location of tweet at us and location of theft to calculate a distance.