We have made available, for you, contact lists of people in the music industry who can help further your career. While it's never a good idea to spam an entire list with email, it is helpful to know who's who and build a relationship with that person, one on one.
With the ability to find people on social media, it's best to get to know these folks and engage them in conversation (a search for them at the social media platform of your choice will give you access to who they are as a person). Find some commonality, and begin interacting with them. After you engage them, let them know how you can benefit each other.