The only value to an SMB of using Plus and the only reason I recommended it was that it put messaging and an image on the front page of Google search. That post conveyed a positive brand message AND pushed “people also search for” competitors below the fold on many displays. It was a once a month, easy to implement tactic where an SMB could simply cross post content from Facebook.
It would seem that Twitter content can now provide a similar and perhaps even better alternative for local businesses to push their marketing message into Branded search results on Google mobile search results. It seems like it would be a simple matter to cross post from Facebook as way to achieve some additional, controlled exposure on a Google branded search.
Minimally it makes great sense as a way to control front page content on Google for reputation management.
I have never recommended Twitter for local before. This might be enough reason.
Using A Twitter Stream to Reinforce Mobile Local Branding on Google by Mike Blumenthal