Two mistakes to avoid when using social networks to promote your music...
1) Avoid becoming a social network spammer...
A few, well placed but personal messages can do more to promote your music than blanket posting the same recycled stuff everywhere. Remember, social media is about making social contacts. Take time to talk to people, listen to their interests before blasting them with "Listen to my song it is great!"
2) Don't flame...
If someone makes a critical comment about one of your songs you should do one of two things;
- Ignore it.
- Thank them for their interest.
Do not be tempted to call them a 'know nothing *&^Łer!' this will not achieve anything.
Courtesy and respect will get you far in the music business.
See: Arizona Journalist Exacts Revenge on Spam-Slinging Musician