In addition to the Jabhat Al Nusra in Syria, the other AlQaeda-affiliated faction ISIS (Islamic State of Iraq and Sham) has gained grounds in the northern parts of Syria to the extent they are not seen as militiamen wandering the desert, but rather than they have presence within the populated areas, and trying to establish an Islamic system.
They are engaging with all possible means which shows their strategic minds and financial backings; they publish books, have offices, manage a police force, operate courts, organise gathering, distribute aids, posts street ads and graffiti.
Sadly, they help Bashar Al-Assad and his case, and probably Al-Nusra and ISIS have actually prevented the fall of the regime. Below are few photos about the ISIS public presence. I ensured no weapons appear in them so you can appreciate the impact: