With all due respect to the people spending countless hours behind a computer screen doing web "research" as a hobby to solve cold cases, this is about as exciting and cutting edge as a 1980s ad for the internet.
The premise (and honestly, the entire substance) of the series is how mostly retired people with too much time on their hands discover the power of the internet and such exciting new technologies as "online forums" and "Facebook" to gather more or less useful information in cases long cold.
This is no doubt useful. Online sleuthing ts a free resource that has proven to be effective (provided the case itself can make the communal juices flowing) - it is however not exaclt exciting to watch. ABCs forced drama setting and breathless retelling of events is an entirely pointless and almost comical counterpoint to the sedate process of sifting through enormous piles of information online and the entire backdrop of the equally sedate (but determined) main supporting characters.
There really isn't anything even remotely interesting about "using technology" and "awesome powers of social media" in this. Its about tenacious people who know how to google stuff - and about as interesting to watch.