Twitter like Trello is a tool, a mainstream tool got to be horizontal product [1].<p>There is no point discussing about it should be this or that. Feel free to use it the way you want it to be.<p>[1] <a href="http:&#x2F;&#x2F;www.joelonsoftware.com&#x2F;items&#x2F;2012&#x2F;01&#x2F;06.html" rel="nofollow">http:&#x2F;&#x2F;www.joelonsoftware.com&#x2F;items&#x2F;2012&#x2F;01&#x2F;06.html</a>