Didn't General Musharraf have a lot of FB Likes too before his ill-advised arrival in Pakistan? Translating any positive online presence into positive results out on the street is not easy.
Musharraf has supporters, he just doesn't have political skills like Imran to bring people on the streets.
Musharraf right now is the Imran of 2003-04
And you are correct about rarely does popularity on online media translates to streets.