Все верно)) можно также вместо hard использовать heavily)

Yekaterinburg (the gateway to the Ural Mountains), Vladimir (has great historic, architectural, and religious significance in Russia), Suzdal (small, picturesque town in the Vladimir region, which is officially protected against modern developments). There is a lot of information on the internet. Read this, for example http://russianblogger.me/must-see-places-to-visit-in-russia/ I'm Russian and even I didn't know about some of these places)))) now I want to go there))

As I know, the term “social media” is both singular and plural depending on context. In your case it's singular because you say about it as a single entity.