If you want to be successful in social media, you shouldn’t worry about the number of profiles you have.
No need to be everywhere. What you need to do, instead, is focus on quality and building a community of advocates.
Michael Q Todd shares some interesting thoughts in his article:
“Facebook and Twitter deserve and demand some daily attention from everyone. They are “core presences”. The majority of social media interaction and sharing is still happening on Facebook and Twitter but it seems to me now that just doing the two of them is not really enough. Unless perhaps you have a highly engaged Facebook page.”