&gt; I don&#x27;t necessarily agree that one should avoid re-solving &quot;solved problems&quot;. Couldn&#x27;t someone have argued that social media was a &quot;solved problem&quot; between MySpace, Friendster, LiveJournal, etc. before Facebook and Twitter came along?<p>Facebook and Twitter each, as I see it, sought out to solve very specific different problems -- that other alternatives had not at the time. Now, each branched out (and drifted) once successful, and those problems were put under the broader label of &quot;social media&quot;, but they weren&#x27;t really the same as either each other or pre-existing players in the broader &quot;social media&quot; space.<p>Not sure exactly how I&#x27;d articulate FB, but Twitter was all about providing a common one-to-many messaging platform that could be used online and via SMS.